I'd suggest, as they will in the help area, that you clear you internet cache and restart everything. Sometimes things just go a little wacky in memory and something that should be cleared when you log out, isn't being cleared. In any case, it won't hurt.
BTW For anyone using a PC it's always a good thing to restart you PC at least once a week. Something called a "memory leak" can occur and slowly, over time, slow things down and even cause things to freeze. Restarting clears these and gives you the maximum resources the system can have to run things. Just a side note.
AJ