If you have 11.10 beta 1, you'll be auto-notified to update. (If you're locked out, e.g. for users on Linux who didn't have libc++, use the installer and check "Get Betas"). See the release notes for bugs fixed in this beta.
Thanks to everyone who reported bugs! If your bug is not yet fixed, don't panic - we cut b2 quick to fix the pile of "OGL_ubo_is_valid(s_environment_ubo)" crashes. If you have one of these in b2 please re-report it (and auto-report it!)