IDM often downloads “Firefox Documents” instead of

When I load rapidshare links on IDM, sometimes i’ll get docs instead of the rars, but not all the time.
What seems to be the problem ?
Answer #1
either you exceeded your daily download limit or the link is down or your account is dead…
Answer #2
the link may be broken
Answer #3
This happens to me now and then too. I just remove rapidshare from my site logins tab. Close the program, open it again and add your rapidshare log in details again.
Answer #4

Make sure you did this right.
Answer #5
or if the links have got .html on the end of them