Please someone help having problem with my FSX

Hi guys. As i tried to get the best performance of my FSX i used this tweak to reconvert .dds files everything went smoothly acording to tutorial.http://www.simviation.com/cgi-bin/yabb/ ... 1160231570
But there is a small problem, now all my trees have a black triangle around them.Anyone know how to fix it? I'll let the picture explain more.

But there is a small problem, now all my trees have a black triangle around them.Anyone know how to fix it? I'll let the picture explain more.
