This is not so much a question as a general statement that version 1.8 / 1.8.1 of SoureTree for Windows is one of the WORST "upgrades" I've encountered in a piece of production software.
I've already opened a couple of JIRA tickets for issues I've run up against with this new version.
Now, SourceTree is crashing after just clicking a few nodes in the tree or graph. This is really pathetic, guys. It seems like core functionality was totally compromised in this release, and I get the impression that your test suite didn't have sufficient coverage to identify these issues before you released this version to the world.