Confused : $post[field10] randomly not populated? please help

[SDB]

Hi

I have the following code in my postbit_legacy template :

<if condition="$post[field10] == ''">

Seemingly completely randomly, when the thread loads, the $post[field10] variable is not populated.

In fact it seems that none of the user fields under the $post object are populated.

They are either populated for all posts on the thread, or for none, and I can't find any pattern to it.

Any help / pointers would be really great.

Simon