I’m kinda of the belief that the 1.03 code isn’t going to fix your issue. My reasoning is that those aren’t identified as consistent issues on the 1.02 code, either.
Network shares will cause the box to freeze if the share is lost or becomes unstable during a stream. I would investigate to see if you’re having networking problems. I can reproduce this issue if I go de-share something while a movie is playing; the WD will freeze requiring a hard boot. This is actually listed in the knowledge base, too.
Fast Forward and Rewind are dodgy under the best of circumstances. It has to do with the way the file is encoded. DVDs seem to FF/RW VERY well comparatively. My MKVs will continue to rewind for several seconds after hitting PLAY… They do work better if they’re locally attached though.
Remote issues are usually hardware related. Bad Batteries / IR interference / Bad remote / Bad receiver. No one has ever mentioned remote issues that were fixed with Firmware.
The beta software is floating around the net. Do some Googling and you’ll probably find links to it.