The solution to your problem could very well depend on which
version of "flash" you have installed.
While the video is in regular mode (not "full screen"), right-click
on the video itself. From the drop-down menu, click "Settings".
If you get 5 icons on the very bottom row, you might be in luck.
The first 2 icons should both show you a monitor. Click the one
that features a graphic on the bottom of its screen (usually the
first icon). You should thus get "Enable hardware acceleration".
Whatever the box shows you, click the opposite, and then click
on "Close".
Although my advice seemingly goes against the basic principle
of "flash", it actually works. You can always double-check for
yourself by going to Flash's own website. Here is the complete
URL address typed out in full, followed by its direct link:
www.macromedia.com / support / documentation / en / flashplayer / help / help01 . html
http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html
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If this doesn't work for you, and you have the stupid Google Web
Accelerator, please trash it -- it actually ruins YouTube.
Also, stay away from YouTube's beta homepage and any other
utilities or downloaders that people here on Y!A may be shilling,
because their responses have absolutely nothing to do with your
question, and their products may actually worsen your problem.
Besides, what kind of boffo answer is [my paraphrase] "Although
you can't access or watch videos properly, get this downloader."
If all else fails, you might have to go to your "control panel" and
tweak the colors of your "screen resolution" to "16-bit".
Whatever happens, I would very much appreciate it if you could
let me know which solutions worked (and which ones did not)
by clicking my avatar or emailing me at inukjuak90@yahoo.com.