VOGONS has started generating this error on some mouse rollovers today, on many pages, but not, apparently, the home/index page:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Error:
(red M&M/smartie with white X on it)
A Runtime Error has occurred.
Do you wish to debug?

Line: 104
Error: Invalid property value.
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Also got one for Line 81, when rolling over the big J icon to the right of the forum name at the top of this forum.