If you run into issues like these, please make sure that you file bug reports:

        <http://developer.apple.com/bugreporter/>

Also, if you nuke simulator devices in the file system like you showed below, 
make sure that you kill and relaunch the core simulator service. 

Joar



> On 21 Jul 2015, at 13:18, Juan Felipe Alvarez Saldarriaga <[email protected]> 
> wrote:
> 
> I got the same issue with beta 2, also with Xcode 6.4, I just drop all 
> simulators,
> 
> `cd ~/Library/Developer/CoreSimulator/Devices/` then remove all folders, `rm 
> -rf *`, 
> 
> so I add it once again the simulators that I need here: Windows > Devices, 
> press plus sign to add simulators. That’s the only thing that fix it for me.
> 
> Bye.
> 
> --
> Juan Felipe Alvarez Saldarriaga
> http://juan.im <http://juan.im/>
> Twitter: @nebiros
> Google Talk: [email protected] <mailto:[email protected]>
> Skype: jfasaldarriaga
> 
>> On Jul 21, 2015, at 3:08 PM, Patrick Fewell-Hartling 
>> <[email protected] <mailto:[email protected]>> wrote:
>> 
>> My situation has not improved with Xcode 7.0 Beta 4 and its simulator. Both 
>> 6.4 and 7.0b4 seem extremely confused about what simulator versions are 
>> available. Everything I try just adds more 8.4 installations.
>> 
>> https://www.dropbox.com/s/r31afx6xljlq6r9/Screenshot%202015-07-21%2015.55.39.png?dl=0
>>  
>> <https://www.dropbox.com/s/r31afx6xljlq6r9/Screenshot%202015-07-21%2015.55.39.png?dl=0>
>> https://www.dropbox.com/s/vl89ceir0ar9e39/Screenshot%202015-07-21%2015.56.54.png?dl=0
>>  
>> <https://www.dropbox.com/s/vl89ceir0ar9e39/Screenshot%202015-07-21%2015.56.54.png?dl=0>
>> https://www.dropbox.com/s/awlhx2r2qsjm2fl/Screenshot%202015-07-21%2015.56.59.png?dl=0
>>  
>> <https://www.dropbox.com/s/awlhx2r2qsjm2fl/Screenshot%202015-07-21%2015.56.59.png?dl=0>
>> 
>> > xcrun --version
>> xcrun version 23.
>> > xcrun simctl list
>> == Device Types ==
>> iPhone 4s (com.apple.CoreSimulator.SimDeviceType.iPhone-4s)
>> iPhone 5 (com.apple.CoreSimulator.SimDeviceType.iPhone-5)
>> iPhone 5s (com.apple.CoreSimulator.SimDeviceType.iPhone-5s)
>> iPhone 6 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus)
>> iPhone 6 (com.apple.CoreSimulator.SimDeviceType.iPhone-6)
>> iPad 2 (com.apple.CoreSimulator.SimDeviceType.iPad-2)
>> iPad Retina (com.apple.CoreSimulator.SimDeviceType.iPad-Retina)
>> iPad Air (com.apple.CoreSimulator.SimDeviceType.iPad-Air)
>> Resizable iPhone (com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone)
>> Resizable iPad (com.apple.CoreSimulator.SimDeviceType.Resizable-iPad)
>> == Runtimes ==
>> iOS 7.1 (7.1 - 11D167) (com.apple.CoreSimulator.SimRuntime.iOS-7-1)
>> iOS 8.1 (8.1 - 12B411) (com.apple.CoreSimulator.SimRuntime.iOS-8-1)
>> iOS 8.2 (8.2 - 12D508) (com.apple.CoreSimulator.SimRuntime.iOS-8-2)
>> iOS 8.3 (8.3 - 12F70) (com.apple.CoreSimulator.SimRuntime.iOS-8-3)
>> iOS 8.4 (8.4 - 12H141) (com.apple.CoreSimulator.SimRuntime.iOS-8-4)
>> == Devices ==
>> -- iOS 7.1 --
>> -- iOS 8.1 --
>> -- iOS 8.2 --
>> -- iOS 8.3 --
>> -- iOS 8.4 --
>>     iPhone 4s (0A1CB5ED-286A-43DC-AB5F-F1B0A5C205B3) (Shutdown)
>>     iPhone 4s (46178A81-C26C-4237-BF62-A8CA7CCD6172) (Shutdown)
>>     iPhone 5 (B1962625-7BDB-47DC-922D-68267B2BFB1D) (Shutdown)
>>     iPhone 5 (3BC77D54-726D-4689-9F08-764B2EEA2CCB) (Shutdown)
>>     iPhone 5s (0CC5DC72-B6CD-404C-895B-974C5C06BF98) (Shutdown)
>>     iPhone 5s (3594065A-AD3F-47BD-9740-C8DEC3562691) (Shutdown)
>>     iPhone 6 Plus (9A81E1D4-A6D4-4CD6-BCDD-80321715B313) (Shutdown)
>>     iPhone 6 Plus (0FB68757-A7BD-4D8C-B80D-365D2EB4E215) (Shutdown)
>>     iPhone 6 (1E37E669-3B3C-412F-B4DA-F75D8AE0559C) (Shutdown)
>>     iPhone 6 (10276838-DA7C-41B5-8164-D7AEFFB049F0) (Shutdown)
>>     iPad 2 (09D9DB91-3EC7-4C2F-BA83-475BB482153E) (Shutdown)
>>     iPad 2 (8F80A8A8-5064-438F-B72C-8CA3EE05CC75) (Shutdown)
>>     iPad Retina (430B1F3E-A0DD-4BDD-8C28-E5B31DD7194C) (Shutdown)
>>     iPad Retina (940225DD-5BF9-4FD0-923E-D71C96C10E03) (Shutdown)
>>     iPad Air (6CA1B69B-157A-414A-A2F3-0017EA3A1748) (Shutdown)
>>     iPad Air (8C8D7E4C-2FDC-4301-B04C-CBB052D20630) (Shutdown)
>>     Resizable iPhone (5CA4A9FD-4BB3-4D28-A3DA-1F291FF0D693) (Shutdown)
>>     Resizable iPhone (3D675D5E-B6D8-42E2-9270-708B1F4F2719) (Shutdown)
>>     Resizable iPad (E9764EA4-EDB1-44CE-9DD3-B3EA0D5C70DB) (Shutdown)
>>     Resizable iPad (4E001539-5D71-4AEF-8AE3-89DD7DD626EA) (Shutdown)
>> -- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-9-0 --
>>     iPhone 6 Plus (183F8160-42C0-4438-9457-D086B351B41E) (Shutdown) 
>> (unavailable, runtime profile not found)
>>     iPhone 6 (4B9EFE68-D010-45B1-83FB-25D99A912F68) (Shutdown) (unavailable, 
>> runtime profile not found)
>> -- Unavailable: com.apple.CoreSimulator.SimRuntime.watchOS-2-0 --
>>     Apple Watch - 38mm (C8C58876-0CE9-4E17-8124-3B5ECC5A2F32) (Shutdown) 
>> (unavailable, runtime profile not found)
>>     Apple Watch - 42mm (245CFC51-026A-45E4-95D9-5ECFE08F3EC8) (Shutdown) 
>> (unavailable, runtime profile not found)
>> 
>> Is there anything at all that I can do to try to reset what Xcode thinks is 
>> installed for simulator versions? It’s starting to feel like I will have to 
>> wipe this machine and reinstall from scratch to fix this problem.
>> 
>> Thanks in advance,
>> Patrick
>> 
>>> On Jul 14, 2015, at 9:54 AM, Patrick Fewell-Hartling 
>>> <[email protected] <mailto:[email protected]>> wrote:
>>> 
>>> I ran into an issue a few days ago where Xcode 6.4 started showing the 
>>> simulator UUID instead of the version number in the device selection 
>>> pull-down menu:
>>> 
>>> https://www.dropbox.com/s/jvoip1nb06ud7jn/Screenshot%202015-07-10%2009.37.43.png?dl=0
>>>  
>>> <https://www.dropbox.com/s/jvoip1nb06ud7jn/Screenshot%202015-07-10%2009.37.43.png?dl=0>
>>> 
>>> I also have 7.0 Beta 3 installed, and it seemed fine until I started 
>>> mucking around with the simulator installations to try to fix 6.4.
>>> 
>>> I first tried to correct the UUID display in 6.4 by manually removing the 
>>> iOS 8.1 simulator profile from 
>>> /Library/Developer/CoreSimulator/Profiles/Runtimes and then reinstalling 
>>> that version through Xcode. That resulted in every entry in the 6.4 
>>> pull-down menu being duplicated, although each entry had a distinct UUID. 
>>> The 7.0b3 devices list was unaffected if I remember right, but I don’t 
>>> remember for sure because I was getting pretty frustrated/erratic at this 
>>> point. In an effort to fix that, I followed the instructions in the 
>>> following post about using the Devices interface to remove the simulators:
>>> 
>>> http://stackoverflow.com/questions/31285059/xcode-6-4-showing-duplicate-simulators-with-unique-id
>>>  
>>> <http://stackoverflow.com/questions/31285059/xcode-6-4-showing-duplicate-simulators-with-unique-id>
>>> 
>>> I removed everything one by one through the Devices list including the 8.4 
>>> simulators (which I almost certainly shouldn’t have done in retrospect). At 
>>> that point, I found myself unable to reinstall the simulators because the 
>>> Downloads tab in the Xcode preferences showed everything as already 
>>> installed, but Xcode had no simulator versions available at all. By this 
>>> time, I had removed and reinstalled Xcode 6.4 through the App Store twice, 
>>> but that did not help anything. I have removed and reinstalled 7.0b3 once, 
>>> also to no effect.
>>> 
>>> The next thing I did was remove every .simruntime bundle in 
>>> /Library/Developer/CoreSimulator/Profiles/Runtimes and every .dmg in 
>>> ~/Library/Caches/com.apple.dt.Xcode/Downloads manually. Xcode then showed 
>>> that I could download simulator versions, but installing them doesn’t seem 
>>> to be doing much. I think that installing the 8.3 simulator restored the 
>>> 8.4 installation, but that doesn’t make any sense to me. Here is the 
>>> current state of my Downloads and what devices Xcode 6.4 knows about:
>>> 
>>> https://www.dropbox.com/s/weyvw68sqwnmhxb/Screenshot%202015-07-14%2009.22.49.png?dl=0
>>>  
>>> <https://www.dropbox.com/s/weyvw68sqwnmhxb/Screenshot%202015-07-14%2009.22.49.png?dl=0>
>>> https://www.dropbox.com/s/si8t53dpztnu346/Screenshot%202015-07-14%2009.23.03.png?dl=0
>>>  
>>> <https://www.dropbox.com/s/si8t53dpztnu346/Screenshot%202015-07-14%2009.23.03.png?dl=0>
>>> 
>>> I still have no simulators for 7.0b3 use. It’s a relief to have any 
>>> simulator versions at all in Xcode 6.4, but what I would really like is to 
>>> do a "factory reset" on Xcode and just reinstall everything as if I have 
>>> never used Xcode on this machine before. Is that possible?
>>> 
>>> Thanks,
>>> Patrick
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