I have Xara 10, and made a website in it that works wonderfully.
Today, it asked to have an update, some 44 MB or so, that it said 'fixes problems' with the version & reports on how the program has been used so far. I said "Yes" & it downloaded the update / that was successful.

Now, I cannot publish changes to the site.
It will go through the motions: saving, preparing, getting ready for export
It will ask for the FTP name & everything goes smoothly

Then, right before it usually asks for the password to the FTP it makes the error box instead with

"xara attempted an unsupported operation"

And the only option is to push 'ok'.
That's it. There's no error codes, nothing else messes up, it just has no way to go any farther than that.
I tried closing & re-opening the program. I tried making a small change & re-saving the site. Neither helps.

What operation is it? How did it get unsupported?
Any help with this rather vague error message is much appreciated,