You might want to do a better job testing your software before releasing it.
I was happily reading a PDF document when I wondered why the taskbar clock was where the start button should be. Also, Adobe Reader had rendering glitches everywhere. Recognising the symptoms, I fired up task manager:
Yes - Adobe Reader X 10.0.1 has a large GDI-resource leak bug. This happens when the semi-transparent light blue search box overlay is visible. If you are in select mode, a chunk of resources will be leaked every time the text cursor flashes. Otherwise, just scrolling around will leak a chunk of resources. Eventually you will reach the default 10k limit. Lovely. Eventually my taskbar responding.