Kevin,
The Edit page should normally redirect you to the home page after saving. I'm not sure why it wouldn't do that just because of the Force Password Change plugin, but if you could try the following and let us know what happens, we'd be happy to investigate further.
* Unpublish the plugin, try to register and go to edit your profile. If you save here, what page are you redirected too? If you stay on the same page like when FPC is enabled, that's not what's causing the issue.
Thanks, and sorry for the delayed response. Even for the 'free' extensions, we try to deliver a higher level of support than a week-long response time.