A month ago Adobe had pushed out its Flash Player 10 Release Candidate for Linux and their other supported platforms. Flash Player 10 introduces new 3D features, updated APIs, V4L2 web-camera support, and a variety of other improvements...
This release is a clear regression, when you do ldd on it you see this:
./libflashplayer.so: /lib/tls/libc.so.6: version `GLIBC_2.4' not found (required by ./libflashplayer.so)
libnss3.so => not found
libsmime3.so => not found
libssl3.so => not found
libplds4.so => not found
libplc4.so => not found
libnspr4.so => not found
Yes, that transparent menu/background things are fixed - all overlapping stuff works (example see the menus in adobe's own website ). In fact I remember I was happy to see it fixed in the version released in May itself .
Although a thing to note - sometimes sites with such overlapping menus crash, like nvidia.com (although I don't know its because of overlapping menus or heavy flash'ing in general).
On a related note, the website crashing thing is/was very frequent with firefox 3.0.X. Fortunately, I have been content with firefox 3.1 trunk (minefield).
Also here is something - on my year old Gentoo (glibc 2.5, gcc 4.1.2, ..), minefield with this latest flash beta works perfectly. But on Ubuntu 8.04.1, firefox is buggy as expected (nvidia.com crashes for example), but minefield also has some glitches - example playing youtube videos fullscreen hangs the browser.
The two nagging issues for me that have been fixed with this rc - some flash sites are faster and more perfect (like yahoo.com, nvidia.com, bbc.com), playing youtube videos in high quality no longer says " video no longer available.