Foxit Reader

1. open pdf from network source
2. minimize foxit reader
3. network source becomes unavailable (possibly after hibernation / move location of laptop)
4. show foxit reader (everything looks fine)
5. scroll down until the next page

Spawns endless message box with error sign on screen. No error text visible. Windows GUI becomes extremely slow. Windows GUI shadow effects (windows 7 aero desktop) get messed up. Harddisk start getting really active.

After killing foxit reader process with task manager harddisk keeps very active. But GUI is (more) responsive again. Only way to return to normal HDD activity is by rebooting OS.