I figured it was time to get rid of the "Come to the Seminar" teaser on the website; after all, it happened last Wednesday. As it happens, the text for that part of the main page is rotated in randomly - sometimes there's a VW graphic and a link to VW info, and other times there's an ObjectStudio graphic and a link to ObjectStudio info. So, I updated the pull file for that, kicked the website and... nothing.
Well, after pondering it for awhile, it turned out that I have been inadvertently caching the possible text rotations. There's supposed to be a random pick between two text snippets, but I was actually never clearing the collection to pick from - I was incrementally growing it. Once I updated the code to simply re-initialize the collection, it all worked. Dumb :)