How to format 'Product Review' text box font ?

[RateU]

It will happen till you fix the custom thread fields that causing the problem. You need to know which custom thread fields causing the problem. Maybe you have a non standard conditional structure inside the Display Format or Blank Replacement Value.

Just for temporary, I think you can commenting out this line from inc/plugins/xthreads.php:

PHP Code:

@include_once MYBB_ROOT.'cache/xthreads_evalcache.php';

---

Fix the custom thread fields which causing the problem, then revert the code above back.