I'm running Cakewalk by Bandlab 2019.05 (Build 31) and Melodyne Editor 4.2.1.003. I think these are the latest versions of both. When Melodyne works, it's great, but it's hit or miss when I create a region FX with it. Sometimes when the editor opens I have blobs, and sometimes not. I have tried making sure my timeline cursor is in the region. I have selected long regions (12 measures) and short ones (less than one bar), and it's erratic either way -- sometimes I get blobs, and sometimes not. If