Normally if only part of the briefing is visible using the ingame view, the error normally occurs at the end of the HTML line that is visible and in most circumstances tends to be an end of section marker
eg
<hr>
or a switch that hasn't been switched off properly
eg <p> not terminating later with </p>
<h4> not terminating with </h4>
Also the use of illegal symbols such as "&" can also screw things up
The above are the most common reasons why a briefing doesnt display properly
and the correct title for resistance briefing is Guerrila, not Guer
eg
<! --- "Plan" section for RESISTANCE>
<p><a name="plan.guerrila"></a>
Short description of the mission for the Resistance.
</p>
<hr>
<p><a name = "OBJ_GUERRILA_1"></a>First objective for the Resistance.
</p>
<hr>
hope this helps you solve yer problem mate