Given your seeing this on other modules too then it's almost certainly a problem with a block you've created. Look at the blocks table and change the active flag (pn_active) for each recently added block. Backup prior to doing this.
Always make a backup before making changes to your site this way you can roll back if needed. Also note since there are some
security issues with .723 you should migrate to .750 ASAP (and should have migrated to .726 last year).
Lastly please don't post the same issue is multiple forums, it dlultes the responses you get and some people may not even bother instead preferring to help those have followed the posting guidelines. If you don't get a repsonse within 24 hours or so simply bump your post up one. But at the same think about what further information you can provide, what the change that caused the problem may have been (things don't break on thier own) and what you can do to work through the problem.
-Mark
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