XenWord 3.0 remains in alpha until testing is complete under several different environments.
A modified version of the 3.0.0.06 version has been uploaded to this site and activated. The 500 error did not appear during the activation, and this post is a test of the new thread creation system with XenForo 1.5.3.
XenProduct Manager was updated to 1.2.7 earlier this evening.
Looks like the xenword-public.CSS for this site needs to be modified.