Posted replies are not visible if longer than a few rows

Hello,
I just noticed that the text of long replies is not visible on the forum. If I post a repliy of about 100 words, it's visible, more than that it's not (roughly).
If I edit the reply, all the text is visible in the edit form, but after saving is being hidden again.

There is no maximum characters set in easydiscuss for post replies, and I receive no errors messages. It was working fine until the last update I guess.

If you solve this on the test site (access details provided) please let me know how to apply your fix on the live site too.

Thank you