Flash player on linux was buggy as hell, is buggy as hell and would continue to be buggy as hell as long as Adobe would continue doing like they were doing for last few years. Here is good discussion on topic about nVIDIA vs. Adobe Flash crappy ness on linux, welcome to join us:
http://www.nvnews.net/vbulletin/showthread.php?t=161664
Also, here is yet another bug report to Adobe about bugs on linux, support it by voting:
https://bugbase.adobe.com/index.cfm?...bug&id=3002806
What bothers me most with Adobe Flash Player for linux is that there are several bugs in it that were here for ages (several years) despite being long ago reported to Adobe bug tracker. Most notable are: black color is used as the overlay key when utilizing accelerated rendering under linux (results in flash contents showing through any other app having some parts of gui colored black); overlay remains enabled even after termination of all Flash Player processes - one would have to reboot the system in order to restore black color displaying back to the normal state; playing video inside Flash Player with VDPAU acceleration enabled tends to totally hang the system when used extensively; full screen video playback is totally broken on multi-monitor systems having Xinerama and/or TwinView enabled.