This "Unhandled Exception:GC clrMemBit: membit not set!" is something I came across when I finally got FMOD streams working. As I understand it, basically, BlitzMax's garbage collector means that all streaming audio is impossible because the GC won't allow a separate thread/callback function thing going on for long before throwing a fit and killing your app. It's the same reason why requests for an official thread library are always shot down.
I'd love to be proven wrong.
I'd love to be proven wrong.