Let me know if this works:
PHP Code:
<if condition="is_member_of($post, #)">
<td class="postbit" width="175" style="border: $stylevar[cellspacing]px solid $stylevar [tborder_bgcolor]; border-top: 0px; border-bottom: 0px id="td_post_$post[fieldx]">
<else />
<td class="alt2" width="175" style="border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-top: 0px; border-bottom: 0px"></if>
Replaced the "#" towards the top with the field ID number.
Note: This was used in parallel with the template mod -
https://vborg.vbsupport.ru/showthread.php?t=203850