I made a character set-up with Auto-Patch, Cutter - pretty basic stuff.
It works fine on Harmony 14. But on Harmony 15, the filter effect deactivates as I move the mouse from the node window to any other window.
I have to disconnect and reconnect the filter to the composite to make it visible again. But when I move the mouse, the glitch repeats.
I tested the file on 3 different pcs. The issue occurred on 2 - both with harmony 15.