Wow. You always expect some people to have odd issues after an update but strange that the first one should pop up in code that I do not believe had any changes at all! And I have to admit up front that I have no good ideas as to why this should be the case…
Is there any chance that you could set us up with an SP Admin account so that I can use the data inspector tools to see if I can trace what might be happening? It’s almost certainly going to be something simple (I hope!) and this should allow me to trace the flow. It wont effect any other users on the site.
If you would be willing to set this up then please PM credentials to both myself and to ‘Mr Papa’. Please include in the PM a link to your site, a link to this thread and brief reminder of the problem. And one of us will take a look for you ASAP. But it DOES need to be an SP Admin account – not necessarily WP Admin.