WLM 9.0 is a private beta, and unless you're a Beta Tester, you shouldn't be using it in the first place.
Secondly,
quote:
Originally posted by Changelog
Keep in mind that compatibility with beta versions is never perfect. For example, you won't be able to decrypt RLE files in WLM9 and you may receive an error message about wlcomm.exe when installing Messenger Plus! or restarting Messenger. This is all part of the joy of using beta versions.
This could be one of the problems of using a beta version.