I've been having some issues with an update of one of my models. The earlier model was excepted and printed fine. Now I only get errors. So, finally, I went back to my original collada export (last modified April 12th) and tried to upload that one. And that one is also not excepted anymore. I noticed that colors now also appear in the previews, while they were previously just white, so I'm estimating that shapeways is using a different collada importer. So, I have a collada export here that was excepted before and prints fine, but I can't upload it again anymore. What happened?