I noticed a strange thing last week which could simply have been coincidental...If I was on DC and using an instant messanger box at the same time my computer would stop loading the internet and I'd have to restart the pc. This happened 3 times, each on a different day, but certainly did not happen every time that I had the two going at the same time, so I wouldn't begin to say it was DC's doing
I'll hit "submit", the little progress bar will go through it's motions then say "done". Sometimes it will have submitted without refreshing and sometimes you have to hit Submit a second time to get it to take and even then it dosen't refresh.