AddOns won't load

[orreso]

When I go to the charatcer select screen, all but the KLH Threat meter will show up as being able to be used ingame my AddOns are; KLHThreatMeter, CEnemyCastBar, TitanPanel, TrinityBars, X-Perl, Atlas, and AtlasLoot Enhanced, only the threat meter will load in the AddOns window at the character screen, please help me why this is happening, if it helps, I run Mac OS X (it was the only thing I could afford at the time)