I wonder if it is the mix between retina and non-retina screens which is 
causing the problem.

I notice Mattias mentioned he couldn't reproduce with two retina screens, but 
both you and graham have a mixed setup?

Warmest Regards,

Mark.

P.S. There's clearly a problem here in the engine if hit testing on stacks 
isn't working correctly.

Sent from my iPhone

> On 14 Jan 2018, at 12:13, Graham Samuel via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> 
> Hi Brian
> 
> Well I tried to line up the tops of the two displays using the Mac Control 
> Panel and restarted LC. This did have an interesting effect, in that the 
> windows on the monitor are now accepting mouse clicks, but there is still 
> some very weird stuff, in particular I have a substack with single card (it’s 
> for logging). I am 100% sure that the stack is visible, and its rect is well 
> within what I understand to be the available coordinates of the combined 
> display, but it doesn’t show up! Changing its loc to the screenloc doesn’t do 
> anything either. So there is bad stuff going on here. I’m on a deadline so I 
> can’t look any further just now. Might just have time to restart my machine 
> with the monitor off, but debugging on a laptop ain’t pretty. I suppose I 
> could use the full retina resolution and a magnifying glass… annoying.
> 
> Cheers
> 
> Graham
> 
>> On 13 Jan 2018, at 20:07, Brian Milby <br...@milby7.com> wrote:
>> 
>> @Graham, to determine if the 2 are related to the same underlying issue, you 
>> should adjust your monitor layout so that the tops align. If the problem 
>> goes away, then they are related (even if not identical). If the problem 
>> doesn’t go away, then it is a new issue. That will be something that is good 
>> to know when working on this issue.
>> On Sat, Jan 13, 2018 at 11:24 AM Graham Samuel via use-livecode 
>> <use-livecode@lists.runrev.com <mailto:use-livecode@lists.runrev.com>> wrote:
>> Yes, of course it’s an OS thing really. I think it’s reasonable to want the 
>> Mac control panel configuration to mimic the physical arrangement I actually 
>> have. If I don’t do this, I’m always trying to make the mouse go somewhere 
>> which the Mac doesn’t see as part of the screen real estate. Since my 
>> physical arrangement is that the monitor is higher and to the side of the 
>> MacBook, that’s what I’ve set up in the control panel. The fact that this 
>> gives problems has clearly got to be a bug.
>> 
>> After looking carefully at the bugs Martin has listed (one of which was 
>> raised by me, centuries ago!), I decided to submit a new report: it’s 20867. 
>> The mother ship may find that they can combine it with 19302, but I will 
>> leave that to them.
>> 
>> Graham
>> 
>>> On 13 Jan 2018, at 16:55, J. Landman Gay via use-livecode 
>>> <use-livecode@lists.runrev.com <mailto:use-livecode@lists.runrev.com>> 
>>> wrote:
>>> 
>>> It isn't the physical position of the monitors, it's how you arrange them 
>>> in the Mac control panel. This allows you to set the virtual position of 
>>> the two displays relative to each other. If I remember right, problems are 
>>> avoided if you drag the two monitor images so that the tops are 
>>> horizontally aligned.
>>> 
>>> --
>>> Jacqueline Landman Gay         |     jac...@hyperactivesw.com 
>>> <mailto:jac...@hyperactivesw.com>
>>> HyperActive Software           |     http://www.hyperactivesw.com 
>>> <http://www.hyperactivesw.com/>
>>> 
>>> 
>>> 
>>>> On January 13, 2018 8:51:59 AM Graham Samuel via use-livecode 
>>>> <use-livecode@lists.runrev.com <mailto:use-livecode@lists.runrev.com>> 
>>>> wrote:
>>>> 
>>>> Thanks Martin - yes I do have a Mac Book Pro Retina, and since it’s 
>>>> normally on my desk with the monitor on a stand, the monitor is above the 
>>>> MacBook as you say. My search for bugs related to this didn’t turn up 
>>>> anything relevant: maybe I don’t understand how to do searches for 
>>>> unresolved bugs in particular areas. Anyway I missed the bugs you mention. 
>>>> Obviously I will now look at them and see what I can contribute.
>>>> 
>>>> Thanks again
>>>> 
>>>> Graham
>>>> 
>>>>> On 13 Jan 2018, at 14:34, Martin Koob via use-livecode 
>>>>> <use-livecode@lists.runrev.com <mailto:use-livecode@lists.runrev.com>> 
>>>>> wrote:
>>>>> 
>>>>> I have experienced problems with dual monitors attached to my Mac Book Pro
>>>>> Retina with LC 8 and posted bugs.
>>>>> 
>>>>> http://quality.livecode.com/show_bug.cgi?id=19300 
>>>>> <http://quality.livecode.com/show_bug.cgi?id=19300>
>>>>> http://quality.livecode.com/show_bug.cgi?id=19302 
>>>>> <http://quality.livecode.com/show_bug.cgi?id=19302>
>>>>> 
>>>>> There are links on 19302  to other bugs I thought might be related.
>>>>> http://quality.livecode.com/show_bug.cgi?id=15366 
>>>>> <http://quality.livecode.com/show_bug.cgi?id=15366>
>>>>> http://quality.livecode.com/show_bug.cgi?id=18363 
>>>>> <http://quality.livecode.com/show_bug.cgi?id=18363>
>>>>> 
>>>>> It seems the issue occurs only when the arrangement is that  secondary
>>>>> external monitor is above the Mac Book Pro's monitor.  If in the Display
>>>>> Preferences > arrangement I drag the secondary monitor to the side of the
>>>>> primary monitor the issues I experienced were resolved.   It may also be 
>>>>> an
>>>>> issue with my retina display.  Do you have a Mac Book Pro Retina as well?
>>>>> 
>>>>> You should post what you are seeing as a bug and reference these other 
>>>>> ones.
>>>>> 
>>>>> Martin Koob
>>>>> 
>>>>> 
>>>>> 
>>>>> --
>>>>> Sent from: 
>>>>> http://runtime-revolution.278305.n4.nabble.com/Revolution-User-f278306.html
>>>>>  
>>>>> <http://runtime-revolution.278305.n4.nabble.com/Revolution-User-f278306.html>
>>>>> 
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