Jerome,
Thank you for replying, though I did have the latest versions of miniMg-V and Mg modular-V; but I could not select those two within Cubase Elements 7 (with Mac OSX 10.9.3). After a lot of work, I'm back to Mac OSX 10.6.8 and Cubase LE4, and things are working OK again (I re-loaded all of my synth plug-ins, then it took a while to get back to the latest versions again). Somewhat of a dilemma, because I know I can't stick with that set up forever. Looking through the Cubase forums, it seems there is a huge amount of bugs with Cubase 7, and Mavericks has had a reputation for its share of problems also.