I have similar issues on my single screen Mac Book Air running Lion, so I 
wouldn't have thought it was anything to do with the dual screens.

On 5 Jan 2013, at 06:35, Luke Evans wrote:

> Actually, further to (1) it appears that if the RPCEmu window is positioned 
> near the origin of the main screen (bottom left) then the mouse behaves 
> correctly when re-entering the window (transitioning from the Mac OS X 
> desktop to the RISCOS desktop in RPCEmu).  So, I think that does support the 
> hypothesis that the issue is some offset calculation.
> 
> I don't know if this is significant, but the two monitors that I have 
> attached to my Mac Pro have slightly different geometries (the main monitor 
> being higher resolution).  Mac OS X allows you to position the logical 
> geometry of the two screens adjacent to each other (to the left or right) 
> with an arbitrary vertical offset of a smaller screen against a larger one.  
> I'll need further play-time to determine if this, or simply the dual screen 
> setup, is a factor.
> 
> 
> On 2013-01-04, at 7:28 PM, Luke Evans <[email protected]> wrote:
> 
>> I've just installed RPCEmu on Mountain Lion - originally off the ROOL USB 
>> drive (0.8.8), then the 0.8.9 build from the web.
>> There seem to be a few issues however:
>> 1. The mouse seems to get messed up after leaving the RPCEmu window for the 
>> first time.  When returning to the window, the position of the RISCOS mouse 
>> will get clamped to a particular boundary and not move beyond that - perhaps 
>> affording some movement in a portion of the RISCOS desktop, but not all.
>> This seems to be an incorrect bounds/offset calculation when the mouse 
>> reenters the window.  I wonder if this has to do with multiple monitors 
>> (which I have), but I haven't tried on a single monitor system yet.  This 
>> bad state seems to get reset if the RPCEmu window is deactivated and 
>> reactivated (i.e. click on another window, then click back on the RPCEmu 
>> window's title bar), but the situation will arise again once the mouse 
>> leaves the window bounds again.
> 
> 
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