Unchecking of option "Allow SourceTree to modify your global Git and Mercurial config files" is not sustained after restarting SourceTree

Summary

Unchecking of option "Allow SourceTree to modify your global Git and Mercurial config files" is not sustained after restarting SourceTree

Environment

SourceTree 1.8.2.11 for Windows

Steps to Reproduce

1. In SourceTree, go to menu Tools > Options > tab General
2. Uncheck the "Allow SourceTree to modify your global Git and Mercurial config files" checkbox
3. Click "Ok" to close the dialogue
4. Go back to Tools > Options > tab General
5. Note that the "Allow SourceTree to modify your global Git and Mercurial config files" box is still unchecked
6. Exit SourceTree
7. Start SourceTree
8. Go to menu Tools > Options > tab General

Expected Results

The checkbox "Allow SourceTree to modify your global Git and Mercurial config files" remains checked

Actual Results

The checkbox "Allow SourceTree to modify your global Git and Mercurial config files" is unchecked