Can no longer replace a synth via drag and drop
I used to be able to replace a synth by dragging the plug in from the browser to the synth track where I'm trying to replace it. It appears to be disabled now. I can drag to create a new softsynth track, but not replace one. Don't know when this happened, possible after last X3 update, but not sure. But as I drag it, when the cursor gets to the track it doesn't work and nothing changes.
I haven't changed any settings, but I'm pretty sure this should be working as it used to.