Unable to launch External Diff tool

[Matt Klaczak]

Hello, when I use Sourcetree, the External Diff option does not load. I am using SystemDefault as my "External Diff Tool". There are no values in the "Diff Command" text box and "Arguments" text box. I DO see the backup files created in SourceTree when I try launching External Diff but no process ever launches and no application ever launches.

According to the Process Viewer, the command that runs when I execute an External Diff is:

{ "Command": "git\r\n-c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks difftool -y --\r\nMYFILE.java", "Directory": "C:\\Users\\MY_USER_DIR", "Status": "Running", "Duration": "00:00:18.3061279", "CallerContext": "GetExternalDiffProcess", "Output": null }

I used to be able to launch my preferred diff tool (Devart Code Compare) via SourceTree  However, for a while now I haven't been able to.

Do you guys have any suggestions? Any help would be greatly appreciate.