I must thank MrPantucci for making me aware of this. The solution comes from the official bug report for this issue.
- Hit ALT+F2 and enter
- gksudo gedit /usr/lib/nspluginwrapper/i386/linux/npviewer
- add the following line BEFORE the last line of text
- export GDK_NATIVE_WINDOWS=1
- Restart any applications using flash
Originally Posted at OMG Uuntu