What is this error caused by?

[Raindog]

I've been dealing with bzr problems all day, it seems it hates me. I 
can't seem to commit anything to my repository. I've waited for the 
operation to complete about 12 times waiting a total of 2 minutes - 20 
minutes before pressing Ctrl+C. When I do press ctrl+c this is what I get:

bzr: ERROR: A nested progress bar was not 'finished' correctly.
Terminate batch job (Y/N)? y


I then have to release a lock on the remote server.

What I dont understand is it works fine on other branches, and this 
branch is not very big, 200 files and my changelist has 30 really small 
modifications to files.