a. Did not switch to a different browser - still using Chrome (Mac OS X)
b. Doing this from Macbook
If I leave the site for a short period of time and return, I'm no longer logged in. (Don't remember that being a problem before.) Some posts work fine, but sometimes I'll submit a reply only to be told I'm not logged in.
I can always try deleting cookies/history, but truth be told I'm kind of a history junkie so it's kind of traumatic for me to lose it.
I haven't tried doing this from the edge extensively. I suppose that would give me more information as to whether it's a browser issue. I'll report back if I have more info. In the mean time, I just have to remember to copy my text before hitting submit, just in case.