Windows 7 Some applications' windows don't show up

Hi all,

I've got a bizarre problem with windows of some applications like AvaFind (instant file finder) and Zend Controller (Zend Server utility). When I launch these apps their buttons are present on the taskbar but their windows just don't show up, like they were invisible. Tried a couple of things including reinstalling these apps and bringing back themes and all that aero stuff (which I have disabled by default) but nothing helps. Plus these apps were running correctly at some point in the past. Dunno what happened, maybe it's something with these windows dimension/position settings (is there a config or registry entry in Win7 where these settings are stored?). Would be great to hear your ideas.

Thanks in advance

PS. If that helps my comp is Acer Aspire 7535G lap, with ATI Radeon Mobility 4570 gpu, Win7 Home Premium installed.