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If it sheds any light on why this might happen I can tell you that clockcalendar is a block I used for a short while. I updated my default theme (no others available on my site to users) and removed the block. There have been a couple of minor XOOPS updates since and now the 2.2 upgrade.
I've also recently switched host server.
I'm thinking that maybe one of the intermediate versions of XOOPS hasn't dealt with blocks as it should have and led to this???
I don't know - it's just a suggestion for someone who actually KNOWS what they're doing...