Looks like this is resolved now, but just for completeness, what are 
ENV["HOMEDRIVE"] and ENV["HOMEPATH"] on your system?

On Thursday, August 25, 2016 at 4:17:59 AM UTC-7, Andy Dobson wrote:
>
> Ah - no - I've got it!  Now it works!  Thank you all very much, especially 
> Kristoffer!
>
>
>
> On Thursday, August 25, 2016 at 12:13:09 PM UTC+1, Andy Dobson wrote:
>>
>> It doesn't seem to. I've tried searching for %.julia_history% to get at 
>> hidden files - is there some other trick to find it?
>>
>>
>>
>> On Thursday, August 25, 2016 at 11:56:22 AM UTC+1, Kristoffer Carlsson 
>> wrote:
>>>
>>> Does that file exist? If so, removing it should fix your problems.
>>>
>>> On Thursday, August 25, 2016 at 12:54:31 PM UTC+2, Andy Dobson wrote:
>>>>
>>>> It says:
>>>>
>>>> "M:\\.julia_history"
>>>>
>>>> (This is not where the program files are written/held - they are on the 
>>>> C-drive, and all outputs are written to a separate networked drive).  
>>>>
>>>> On Wednesday, August 24, 2016 at 6:05:27 PM UTC+1, Kristoffer Carlsson 
>>>> wrote:
>>>>>
>>>>> What does it say when you run 
>>>>>
>>>>> Base.REPL.find_hist_file()
>>>>>
>>>>>
>>>>>
>>>>> On Wednesday, August 24, 2016 at 6:31:58 PM UTC+2, Andy Dobson wrote:
>>>>>>
>>>>>> I've uninstalled everything again, and I *think* I've deleted all 
>>>>>> julia-related files, but when I re-install Julia I still get the same 
>>>>>> error 
>>>>>> message.  
>>>>>>
>>>>>>
>>>>>> On Wednesday, August 24, 2016 at 1:12:25 PM UTC+1, Kristoffer 
>>>>>> Carlsson wrote:
>>>>>>>
>>>>>>> It is likely "~/.juliarc" that is the file you are after.
>>>>>>>
>>>>>>> On Wednesday, August 24, 2016 at 11:47:16 AM UTC+2, Andy Dobson 
>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Hi Kristoffer,
>>>>>>>>
>>>>>>>> I don't know if this is the right file 
>>>>>>>> (/julia-0.4.6/etc/julia/juliarc), but this is what it says:
>>>>>>>>
>>>>>>>> # This file should contain site-specific commands to be executed on 
>>>>>>>> Julia startup
>>>>>>>> # Users should store their own personal commands in homedir(), in a 
>>>>>>>> file named .juliarc.jl
>>>>>>>>
>>>>>>>> # Set up environment for Julia Windows binary distribution
>>>>>>>> ENV["PATH"] = 
>>>>>>>> JULIA_HOME*";"*joinpath(JULIA_HOME,"..","Git","bin")*";"*ENV["PATH"]
>>>>>>>>
>>>>>>>>
>>>>>>>> Should there be more here? 
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wednesday, August 24, 2016 at 10:36:10 AM UTC+1, Kristoffer 
>>>>>>>> Carlsson wrote:
>>>>>>>>>
>>>>>>>>> Maybe you can look into the .juliarc file at the line where it is 
>>>>>>>>> telling you the error is and see if anything looks strange.
>>>>>>>>>
>>>>>>>>> On Wednesday, August 24, 2016 at 11:11:54 AM UTC+2, Andy Dobson 
>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>> No, it didn't create another one. I think you're right and I 
>>>>>>>>>> didn't delete what Julia was looking for. But it seems very strange 
>>>>>>>>>> that 
>>>>>>>>>> this error message appeared without any sort of prompt - I'm not 
>>>>>>>>>> doing 
>>>>>>>>>> anything that I haven't been doing for the last 6 months.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Tuesday, August 23, 2016 at 1:51:54 PM UTC+1, Stefan Karpinski 
>>>>>>>>>> wrote:
>>>>>>>>>>>
>>>>>>>>>>> That's strange. Did it create a ~/.julia_history file after you 
>>>>>>>>>>> deleted the old one? If so, what's in it?
>>>>>>>>>>>
>>>>>>>>>>> I wonder if the ~/.julia_history file you deleted was not the 
>>>>>>>>>>> one that Julia's looking at.
>>>>>>>>>>>
>>>>>>>>>>> On Tue, Aug 23, 2016 at 8:10 AM, Andy Dobson <
>>>>>>>>>>> a_d_m_...@hotmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Hi All, 
>>>>>>>>>>>>
>>>>>>>>>>>> This morning when starting Julia 0.4.3 (which I've been using 
>>>>>>>>>>>> daily since February) I received this error message : 
>>>>>>>>>>>>
>>>>>>>>>>>> -----------------------------------------------------------------
>>>>>>>>>>>> ERROR: Invalid history file (~/.julia_history) format: 
>>>>>>>>>>>> If you have a history file left over from an older version of 
>>>>>>>>>>>> Julia, 
>>>>>>>>>>>> try renaming or deleting it. 
>>>>>>>>>>>> Invalid character: '#' at line 465034 
>>>>>>>>>>>>  in error at error.jl:22 
>>>>>>>>>>>>
>>>>>>>>>>>> ----------------------------------------------------------------- 
>>>>>>>>>>>>
>>>>>>>>>>>> A thread on this site ("PSA: new ~/.julia_history 
>>>>>>>>>>>> format") suggested deleting the julia_history file. I tried 
>>>>>>>>>>>> this, and it did not work. Next I uninstalled Julia and 
>>>>>>>>>>>> re-installed the 
>>>>>>>>>>>> latest (0.4.6) version. The error message is the same.   
>>>>>>>>>>>>
>>>>>>>>>>>> Can anybody suggest a solution? I'm running on Windows 7 
>>>>>>>>>>>> Enterprise. 
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks 
>>>>>>>>>>>>
>>>>>>>>>>>> Andy
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>

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