Flash is buggy and always was. But the newer ones are buggier still.
Here is another discussion of it:
I have a 8200 IGP and flash 10.2/10.3 from Adobe are buggy with it. The Chrome flash version (10.3 d180) works well (anyway, in the bounds of Flash plugin stability as we know it).
There is a prerelease 11 version named "incubator". That seems to work better somewhat.