Original problem (https://code.google.com/p/tortoisegit/issues/detail?id=2518):
1. Install Git LFS (https://git-lfs.github.com/)
* Download and unpack archive;
* Put git-lfs.exe on any avaialble in PATH directory;
* Run "git lfs init"
2. Clone repository from: https://github.com/bozaro/test
3. Change image "tux.png"
4. Show "Git Commit" window
On showing "Git Commit" window you will see black window blink for each changed LFS file (twice in this case).
You also will see black window blink on refreshing change list by F5 key.