Wavelab 9.5 cursor goes BANANAS in montage

Wavelab 9.5 begins to get stuck in a mode where the cursor moves on its own from clip to clip and cannot be controlled or stopped and I frequently have to restart WL. What is happening and how can I get WL back to normal! I thought WL could be trusted nowadays, but nope…!
I run macbookpro 10.14.6 and an UAD apollo interface. fransmo :imp: