Comment 35 for bug 238606

Firefox displays empty grey rect where flash video should be.

For me, it only happens sometimes, after
  watching a video,
  then opening or tabbing through other windows.
When I return, the empty grey rectangle is there, clicking on it does nothing.

Seen on YouTube, haven't tried any other sites yet.

Refreshing the browser page reloads it just fine.

Noticing a second bug; mouse-clicks on flash plugin rect sometimes not recognized.
Ex. Clicking should pause video. Can't hide the semi-trans overlay at bottom of vid (showing soundtrack info)
Will look for apropriate launchpad thread to post that bug.

Info:

Firefox > Help > About Mozilla Firefox :
  Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.4) Gecko/20091028 Ubuntu/9.10 (karmic) Firefox/3.5.4

Click-on-Flash-panel > Copy Debug Info :
sd=BD075FC86&el=detailpage&plid=AAR3pi%5FpjHWZyG3t&md=1&debug%5FplaybackQuality=medium&fmt=5&sdetail=f%253Arelated%252C&nsipbps=12121%2E414387031407&csipt=watch&nsidf=20&cr=US&fexp=905304%2C900036%2C901806&h=360&scoville=1&debug%5FsourceData=BD075FC86&cfps=0&pd=0%2E8060000000000116&w=480&debug%5Fdate=Thu%20Nov%205%2013%3A23%3A44%20GMT%2D0800%202009&debug%5FvideoId=ykNr7Ov%5FcMQ&debug%5FflashVersion=LNX%2010%2C0%2C32%2C18&vid=Op6hVo3t3sp0ALwpn2EEvqnREwPtX8FJC&hl=en