Also I had this problem, and we were not the only one, several communities discussed this behavior.
My colleague found a funny work around. It works on Windows 7 using two screens:
Drag your SourceTree window upwards or away from the 1st screen towards the 2nd screen. This way, the commit button is out of the right-bottom area of your screen.
In my opinion a Windows related issue. For example, at this moment, also my scrollbars in IntelliJ aren't accessible in this area of the screen.
I'm not quite clear on what you mean by "click on Commit".
- Are you clicking the Commit toolbar item, or the Commit button in the File Status view?
- Is the file marked as changed?
- Does committing the text file via CLI work and this is specific to ST?
Hopefully we can get to the bottom of this ASAP.
Principal Developer, Sourcetree