Foren / Cotonti / Support / pm blank page

I Tried this in sed-light..
got a normal inbox and, in a message, a normal messagebody

So try sed-light 1st.

This could also be markitup, since this is what is in the messagebody.
Replace the markitup plugin (completely from the 0.68 download) and de-install and
install it again ????

Markitup had an upgrade in 0.68 and previous versions as well???
did you upgrade ???

enough said, try some off these things...