git gui blame: git-blame loops at 100% cpu

Dear list,

I have converted one of our Visual Source Safe repos to git (about 47000 commits, about 11 years of history, .git about 200 MB git gc'ed). 

Everything seems to be working fine but git gui blame some_file seems to
procedure correct output in the file viewer but the progress bar stops 
at 1271 of 2783 lines for one specific file and then the git-blame process
consumes 100% cpu. 
 
Plain git blame completes in a fraction of a second just fine.

git-1.7.0.1-1.fc13.x86_64 (Fedora 13). I have also tested git 1.7.0.5
- same behaviour. ditto for the latest msys git in Windows.

perhaps I should mention that most of the source files in the repo are using crlf line endings.

The hang does not happen on all files but on many - progress percentage varying.

Konrad