No entry after submit a message

Hi,

I'm using EasyBook Reloaded 2.0.8.1 on a joomla 1.5 site.
Until a view weeks ago, it was working perfectly but right now I have a problem.
When a visitor submits a message in the guestbook, I receive a e-mail with the submission but when I look into the guestbook (front-end), I only see the name, date and location of the message. The textfield is empty!!!
In the back-end the same problem.......the textfield is marked with "..."

When ik go to phpmyadmin and look into the database, the textfield is also empty.

A strange error I think, everything was working fine, nobody changed the settings an now I have this error.
What could be the problem?

Thank you