Beyond Compare 4.1.5 (64-bit Edition) stopped working as Externa Diff Tool

[bvallee]

We installed yesterday "Beyond Compare 4.1.5" (64-bit Edition) on Windows 10 Pro (Version 10.0.10586). In the Options Window of "SourceTree" 1.8.3.0 (under tab "Diff"), we set the External Diff Tool to: "Beyond Compare", but we kept the Merge Tool to: "System Default". It worked fine yesterday but not today. I tried all propositions found on the internet (including yours: I put both selections to: "System Default", shut down "SourceTree", then reloaded it to set both selections to: "Beyond Compare"). I also tried with settings both fields to" "Custom" selections, with the proper command line and arguments (I made different attempts from what I found on the internet), but nothing works. After trying to run  load External Diff, the cursor is flickering a little at moments, but nothing happens. If I load "Beyond Compare" by itself, it works fine. Do you have any suggestion? Thank you!

[bvallee]

Thanks for your prompt answer! I forgot to mention that I also tried today to set the External Diff Tool to: "WinMerge" (with Merge Tool set to: "System Default" as "WinMerge" is not an option there) and it does not work neither (which used to work also as I switched yesterday from "BeyondCompare" to "WinMerge", did some tests then went back to "BeyondCompare" as my External Diff Tool)...

[Seth]

Sounds like some good troubleshooting so far. Have you tested with any other diff tools?