RSP

EDIT: Never mind, figured it out, was missing something semi-obvious (obvious in the beginner guide, not so obvious in the full manual where I'd been looking).

I'm having the same issue today. I can save track presets fine, but if I try to save a new version of my current session with Save As I get the Name Not Valid error. Save works fine, but SaveAs with the only change in the filename being a 1 incremented to a 2, I get the error. Other names do the same thing, regardless of what characters and case I use. SD card is formatted fat32, MBSeq is the latest stable release.