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i guessing that when you're referring to 2.2 and 2.3, you mean 2.2.2 to 2.2.3....
the patches that are released are generally version to version, meaining that a patch to upgrade to 2.2.3 would exclusively be available for those running 2.2.2, not from 2.0.13.1.
i'm not sure if there is a way to go back from 2.2.3 to 2.0.13.1. you best bet may be to apply the 2.0.13.1 to 2.2.0 patch to your site, update, and then patch up from there, though i'm not sure if this will quite work. another alternative might be to put on your site 2.0.13.1 as if you were transfering it to another server (put the MySQL database backup on the site, change mainfile.php, etc.), but as i'm not 110% sure how XOOPS completly works, i'm not sure if the system will still think it's a fresh install. you may want to seek out a better authority when it comes to XOOPS installation to see if there's a way to revert back (someone else is bound to reply to this post, too).
i sure hope this all helps and i wish you the best of luck with your site!
-zimmi88 =)
EDIT: I just realized that 2.2.3 has been declared a Release Candidate, meaning there are glitches that need to be ironed out that could cause elements of the site not to work. That might be the problem, seeing there's two of you that are having this problem.
"Need coffee, keep away..."