Basically, the most recent release of Flash is incompatible with Opera, versions 9.2x and below. The 9.50 Kestrel-based betas and snapshots are compatible with the most recent Flash. I still have trouble with the most recent Flash, on AMD64, so I end up using 9r48 for everything. That article was the best explanation of the issue I could find, however.
Here's a more thorough explanation for you:
http:// my.opera. com/remcolantin g/blog/ 2008/04/ 14/opera- and-flash- on-linux
Basically, the most recent release of Flash is incompatible with Opera, versions 9.2x and below. The 9.50 Kestrel-based betas and snapshots are compatible with the most recent Flash. I still have trouble with the most recent Flash, on AMD64, so I end up using 9r48 for everything. That article was the best explanation of the issue I could find, however.
Good luck!
-Justin