If comical does not open some .cbr or .cbz files, open the file in winrar and save the archive copy as the alternate. In other words if it was a .cbr save it as a .cbz and vice versa. I have been able to open a lot of files that seemed to get stuck in comical that way, assuming the archive file was not damaged or incomplete to start off with. You can also do the same with .rar archives.