I don't know if this is the right way to report bugs, so if there's something else I should do then let me know and I'll be happy to do so.
After installing v15, I immediately found two issues:
1) I installed and imported library with settings, and it immediately started trying to copy my entire library from a network share to my desktop; I canceled it, but have no idea why it decided to do this (I don't have anything in JR set to use my desktop).
2) I decided to try kernel streaming so I enabled it, and then decided to try changing settings on my sound card to see if the features would still work. When I got to disabling the Crystalizer on my X-Fi Extreme Audio, it immediately threw a stop error, faulting CTEXFIFX.SYS (Creative driver). I switched JR to ASIO, and it did the same. I later tried after closing MC, and it still did the same. I can't say for sure that the program had completely closed, but enough time had passed that it should have been.
I'm using Windows 7 x64, Creative X-Fi Extreme Audio, Core2Duo E4500 with 2GB of RAM. I don't know what other info you might need, so feel free to ask. I'm happy to send the mini or full memory dump upon request, and if more info is needed about my system then I can send an .nfo file along with the dump.