how to get Rio Music manager to stop crashing when you load a huge directory?

Don't know what version of RMM you're running, but if it's an older version than the one we're testing for the Karma, it sometimes has the problem of appearing to lock up (no response on screen) even though all it's doing is indexing the disk and taking a long time.

If it's genuinely crashing, it might be because of a corrupt file (or a file with bad or nostandard tag data) somewhere in the directory tree. Try loading only subsets instead of the entire tree and attempt to narrow down, via the divide-and-conquer method, which file is giving it grief. Maybe even save off the offending file so you can show it to the Cambridge guys and they can fix the problem on a future release.