Any chance you could provide a screenshot for us? If we could get a look at your timeline, we can get a clearer idea of what goes on, and we'll get it sorted for you.
Did you by any chance upgrade your OS recently, like right before this problem began?
There is a problem of this sort caused by a font issue, specifically with the "Terminal" font, discussed in this thread
, and it recommends going over here
and downloading the Terminal font to solve the problem. Seems to only effect XP.