Hi...
If you prefer keeping 11.2, you could try reinstalling the "flashplugin-installer" package in Synaptic (package manager.)
However, the fact that this is happening with Chrome, which uses the Pepper version of Flash, suggests there might be another problem that has nothing to do with Flash but is affecting it. What updates did you install and are there any error messages when you try to play Flash content?
Also, please open a terminal and post the results of the following command...
Code:
lspci -nnk | grep VGA -A 12
Regards...