I always have an error like this:
2011-11-23 20:37:09 Failed writing file: [The requested lookup key was not found in any active activation context]
After that, the task stops with red cross in front.
It will report that error again if you restart the task immediately.
What I found is to do a manual hash check and then restart it.
The task will download for a while and get that error again.
It sometimes works good for 3~4 GB data. However, in most cases, it has error less less than 1 GB.
System: windows 7 64 bit professional
bitcomet: 64bit 1.30 stable
BTW, I have RAID0 in my computer.