I have exactly the same issue but in reverse.....computer works fine, phone (android, FireFox) forgets that I logged in (no reply, etc) and if I try to log in I get a grey screen that says go back and try againI cannot log in to the Bruins forum. I cleared my history on my desktop this morning and when I tried to log back in I had to go to the main page. It won't keep me logged in when I go to the Bruins page, won't let me post either and all the ads pop up even though I sponsor.
My phone and iPad are fine because I didn't log out but obviously there is an issue if someone logs out.