Yep, same here using iOS5 beta 3. Crashes when I try to look at my stream or profile.

My Safari crashes so often on iOS5b3 that I'm not even expecting any other app to work properly :(. Now I fully understand why Apple doesn't recommend to use betas on 'production' systems.

Yes, when they say "Beta" they mean it.

I'm still running 4.3.x and it crashes sometimes on the Stream (but works sometimes too).

No doubt an update is forthcoming. :-)

I installed the app this morning and then an update in the afternoon. I'd say the speed of new releases is quite aggressive.