SourceTree not showing the diff just says 'select a file to view the diff'

Question

When I select a modified file the diff isn't shown in the adjacent pane, it just says "select a file to view the diff" even though I have selected a file. Some files correctly show the diff but others don't.
I'm on the latest 3.4.10 version.
Any ideas how to fix this?

David Spitzley · Answer

That's interesting:  II absent-mindedly installed v3.4.18 on a new server using Mercurial, and the diffs don't show up for .php files, but it turns out that .env and composer.lock files (I'm using Laravel, FWIW) display diffs just fine.  So apparently the file type is involved in this problem.

David Spitzley · Answer

It appears that this is still a bug.  I just downgraded from the most recent version back to 3.4.9 and it works again.

joedf · Answer

Downgrading from 3.4.14 to 3.4.9 worked for me. Thanks!

Git diffs worked fine, but not Mercurial diffs...