Sounds like it could be server issues at their end. I was having similar issues, but they appear to be sorting themselves out - i've been able to comment on status without problem ...
I got that this morning when I was trying to comment on a status. I havent noticed if it fixed itself yet though, I just opted to not write on their status is all :P
Thank God it's not just me! I tried uninstalling and reinstalling the app and that didn't work.
The issues have not sorted themselves out and it's been at least two days.