Why does SourceTree tell me no changes detected for unstaged files?

[Anthony Gibbs]

SourceTree is correctly listing the files I've edited, but when I click on any of them, the internal diff area says "No changes in this file have been detected, or it is a binary file or it is configured to be ignored by the File patterns", and then opens a CodeCompare window which correctly displays the changes that were made.

Note my files are not binaries, and the File pattern settings are correct.

This started happening about two weeks ago. I have uninstalled, and then upgraded to latest version, with no change in behaviour; this makes SourceTree borderline unusable.

I have run

git config set diff.tool ''

in the hopes of stopping this, to no avail. Any ideas? 

[Ken Arromdee · Accepted solution]

It seems the problem can be fixed by going into options, git, uncheck "allow external diff drivers".  I can still do external diffs in other contexts.

[Jeff Lett]

Thanks for the suggestion, but I don't see that as an option.  Am I in the wrong place?

[Anthony Gibbs]

Brilliant, thanks @Ken Arromdee that did the trick :+1:

[Jeff Lett]

Running into the same issue with a recent update.  Tried updating to 4.2.11 today and it still happens.  Probably going to try another client soon.

[Ken Arromdee]

This has happened to me too.  I hadn't upgraded for a while and I upgraded and the problem immediately started happening.  There's obviously some kind of bug in the new version.