Weightning cloaks

[ScionTheWorm]

Edit: I fixed it on one model.. I actually had the head as a seperate mesh not attached to the body.. when I attached it, it all works fine, is this really a problem for the cas format?

Original:
okay I have a serious problem regarding weighting cloaks. this has occured on four models where they are modelled separate, not "copied".

I have imported the druid cloak, deleted the hood etc, widened them a little and in general moved the vertices around. Also I have changed the uvw map. I also had to reweighten the vertices because of the new shapes. So here is the situation:

1.) All vertices are weightened against bones: torso, cloak-bones and upper arms.
2.) The model are being exported
3.) The model appear in RTW
4.) BUT: the cloak is missing and some faces appears over and on the sides of the model. On one of the models they were going up trough the sky, and sometimes they covered the whole screen when zoomed far out.

Also, on the last model I can export, but when I try to import this model I get an error message from the import script: '--No ""+" function for undefined.
I guess this may be the core of the problem, but I get this message only on the last model...

btw I attached one of the cloaks to the body, and then it worked, but this is not a solution as it will be hell to make changes, and I have to reweight all the vertices...

Help!