lucy24 - 9:02 pm on Dec 4, 2013 (gmt 0)
Well, I knew it couldn't be just me [webmasterworld.com] :) I posted my own grumble in General because I didn't think it could be bing-specific, and there was obviously no question about the UA. But maybe bing is having a problem.
The part that's clear is that it isn't just making up URLs as you might do if you're testing for valid 404s. These are some other site's URLs getting spliced onto your own.