That seems reasonable though - what messages aren't being responded to? == John == > -----Original Message----- > From: leveller-bounce@xxxxxxxxxxxxx [mailto:leveller-bounce@xxxxxxxxxxxxx] On > Behalf Of Ray Gardener > Sent: Wednesday, October 14, 2009 3:21 PM > To: leveller@xxxxxxxxxxxxx > Subject: [leveller] Re: Vista 'not responding' non-issue > > A fix for Vista's misinterpretation of Leveller being non-responsive > appears to work, so it will be available in subsequent Leveller 3.1 builds. > > What was happening is that Vista "ghosts" an app's window if the app is > not consuming enough messages from its event message queue. The app > window is copied to a buffer that Vista manages, making the window > moveable, but also prone to being misdrawn (there seems to be some > display copy problem if the app uses OpenGL, at least under Aero). > > The behavior was supposed to occur on Windows XP as well, but I never > saw it happen there. > > Ray > > > > Ray Gardener wrote: > > I've noticed that Vista (on my laptop anyway) misinterprets applications > > (such as Leveller) that undertake long processes so that the "Not > > Responding" phrase appears in Leveller's title bar and the app window > > seems frozen. It doesn't seem to matter that the processes are > > interruptible and regularly update the display (including responding to > > paint events). > > > > This happens sometimes when raytracing. The first render may go > > perfectly fine, but eventually some subsequent render will appear to > > freeze even though Leveller is still processing normally. Pressing Esc > > won't stop it but waiting for it to finish will work. The display may > > also show artifacts or pieces of previous displayed information. > > > > I suspect Vista is overly aggressive about long processes that ignore > > the main event loop and starts seeing them as non-responsive. But > > putting all long processes on background threads is not something that > > can be implemented quickly. In the meantime, however, simply waiting for > > the process to end will work. > > > > A search on Google shows numerous other "not responding" issues for > > Vista, but I'm not sure if there is a relationship to the problem I'm > > describing here. > > > > Ray > > > > > > >