Completely off-topic, but could you post a brief description of how you made 
that video David (or send me a PM)? I have to do something similar in the near 
future and it would be good to know what kit/software you recorded with. 

Cheers and thanks,
Mark

> On Oct 9, 2020, at 3:18 PM, David Bovill via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> 
> Here is a video describing the bug - or at least I am assuming it is a bug. 
> Very curious to see if anyone else is experiencing this issue:
> 
> • https://vimeo.com/466580164
> 
> On 9 Oct 2020, 14:48 +0100, David Bovill <david.bov...@gmail.com>, wrote:
>> I’m getting pretty curious about this bug :)
>> 
>> Testing  mouse clicks- and not stacks jumping position when moving their 
>> location - I find that a stack that is successfully moved between the four 
>> quadrants of the screen - accepts mouse clicks accurately in the 
>> bottom-left, top-right and bottom right quadrants - but in the top-eft 
>> quadrant the mouse-click interactions are offset vertically in a way that is 
>> compatible with the stack jump. So if you manage to locate the. Stack 
>> without it jumping - in the top-left quadrant the mouse clicks are off.
>> 
>> Monitor settings are set for default value of the MacBook Pro display. I 
>> think I’ll make a short video of this behaviour.
>> On 9 Oct 2020, 14:35 +0100, David Bovill <david.bov...@gmail.com>, wrote:
>>> Also tested on Livecode 8.1.5 with same results.
>>> On 9 Oct 2020, 14:00 +0100, David Bovill <david.bov...@gmail.com>, wrote:
>>>> 
>>>> Windows intermittently jump to a location on the screen when I move 
>>>> windows. It’s got too annoying to ignore.
>>>> 
>>>> • Is anyone else having this problem?
>>>> 
>>>> I am testing this on Mojave and Livecode 9.6.1 rc2. I am testing this 
>>>> without any of my own code such just was IDE stacks. This I “think” is 
>>>> quite a long standing bug that I suspect is related to the global 
>>>> coordinate system as I have been working around this for quite a while now.
>>>> 
>>>> 
>>>> Detail
>>>> The location of the jump seems to be the same horizontal x location. But 
>>>> with the vertical value being reset to the halfway point.
>>>> 
>>>> I am testing by. Simply moving the message box. It is intermittent - so 
>>>> occurring about once every 5 moves, and strangely is happening only when 
>>>> the top left of the stack window is within the top left quadrant of the 
>>>> screen. Using. The following code int eh message box I find the top of the 
>>>> message box stack is always 492 after a jump (see below). This appears to 
>>>> be related to half the screen less the decorations like menu?
>       > > > put the screenrect & CR & the rect of stack” Message box"
>       > > >
>       > > > 0,0,1680,1050
>       > > > 215,492,634,640
>>>> 
>>>> As a further indication that the problem is due to the IDE, I find that 
>>>> creating a test stack (no scripts or controls) exhibits the same behaviour 
>>>> - but this behaviour can be suppressed by choosing “Suppress Messages” 
>>>> from the “Development” menu. This suppression has no effect on the message 
>>>> box or other IDE windows which still jump intermittently.
>>>> 
>>>> The problem is most intense when working with multiple screens. For at 
>>>> least a couple of years stacks I create and place on second or third 
>>>> monitors receive mouse clicks in the wrong location. This happens on 
>>>> different machines, and different. Monitor setups. Only tested on Macs.
>>>> 
>>>> I am currently creating a multiscreen app - so taking the tracking down. 
>>>> Of this bug more seriously. The current tests are one on my laptop without 
>>>> external monitors, and having restarted the computer (several times). 
>>>> Applications other than Livecode don’t suffer this problem.
>>>> 
>>>> How should I report this bug - should I submit a video / screen recording?
>>>> 
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