[xwiki-users] Attachments on free xwiki.com hosted wiki keep disappearing.

Hi, I've been working mostly on an individual xwiki installation until now, and just started playing with the free hosted virtual wiki service on wiki.com - it's very cool. :) However, I'm trying to attach some small image files (<20k) to my wikis, and the attachments disappear shortly after seemingly attaching correctly. I do not get any error messages or warnings - the attachments just go away. Could this be related to the maintenance that occurred this weekend? Or perhaps is there an attachment restriction on the free wikis? The wikis are loa.xwiki.com and openmpt.xwiki.com. Regards, Robin.