[TYPO3-english] mm_forum empty post body

[Piotr Burda]

Hi
After upgrade to TYPO3 4.5.2 and mm_forum to 1.9.2 i have strange 
problem with mm_forum on one TYPO3 installation.
When a FE user post a new post on mm_forum,topic of post is displayed on 
list but text of the post is empty, in DB table tx_mmforum_posts_text, 
post text is written to field "post_text" but field cache_text is empty.
How to make mm_forum working??

Regards
Piotr