Also, at least for the (quite big) project I’m testing, dragging the VL file onto the window won’t work, only Ctrl+O does the trick.
When opening the same patch again, that failed with Drag&Drop, I get an exception.
Reporting something similar here.
And adding that if the registered version isn’t there anymore it’s opening gamma but not the patch.
Dragging the patch into the opened windows is the only way to start it up.