Sorry, this is not an answer but sounds somewhat related
I only experience this with Analog Lab 3. I run Windows 10 (1803) which is certainly buggy itself
If I drag it onto an existing song, nothing happens..
If I try to replace an existing VI it forces the original vi to disappear but never populates so the track becomes blank
If I instanciate AL3 on a new song first it works but about 50% of all other plugins now react like AL3 above.
AL3 is the current v18.104.22.1689 and it still happens on S1V4.01