If this happens again, please upload launcher.log so we can see what's going on. Do this before loading the launcher again or you'll lose the log.
I've added a fix which stops config.cs and observerconfig.cs from being deleted, it's released in version 0.6.8 of the launcher, which should protect anyone else when they update.
As for your voicepacks being deleted - did you set them to read only? You
must set any file which isn't in the
list of protected files to read only. The new launcher deletes any crap which doesn't belong there. The alternative option is to package your voice pack as a zip in the root directory so you don't need to use the crappy hack.