Manga+Press 2.0 beta is getting set to roll out sometime this week. A number of changes have been made to Manga+Press, namely the way Manga+Press uploads the comic pages. However, before users can upgrade, one of the files in the current release branch needs to be patched first.
The reason is the hook that is called when Manga+Press is deactivated. The hook deletes all of the options and the two tables Manga+Press uses to keep track of comic posts. Since the proper way of upgrading a plugin usually involves deactivation and deletion of the files, this could be a problem for some users. However, I went ahead and tested the deactivation procedure on the server and…nothing happened. So either there is a bug in 2.7 (fortunate in this case) or the hook in question is no longer being used. Either way, I suggest either downloading the patch I’ve provided or backing up your database; the latter always being a wise choice whenever you’re upgrading a plugin, of course.
Manga+Press: http://manga-press.silent-shadow.net/
Download Patch: mangapress patch