I use this all the time, but it seems to suffer memory leaks if you do a lot of folder analysis and leave it running while you work. I've had it hang on multiple occasions to the point I've had to kill the process and restart it.
Which OS? No issues on Linux Ubuntu here.
I don't use it anymore, but I remember using Meld about fifteen years ago. This project has been running for a long time.
Do you use another software or git instead? I still have use for it even with git.
My workflow is somewhat simpler now. So I make do with Xcode.