Well...Humm You could try an older version. The newer versions seem to be Wreaking Havoc with most members. See Link.
OldVersion - Newer isn't always better ! Version 4.12.3 or 4.12.6 are probably the most stable versions without the useless Bittorrent attempt. Hope this Helps.
If you don't want to try an older version then post your system details and maybe we can help you with the new version.
system details