Upload the texture file to *YOUR* site and then post a link to it here.
<EDIT> P.S. This is more community forum than a support forum. Sometimes the developers respond but, basically, you are relying on the user community to take their own time to help out of the goodness of their own hearts.
<EDIT2> If it helps your problems is when the GC runs.
Turn off GC and it should run OK (or, at least, for much longer).
<edit3> Loop through your vertdata array. It seems not to be holding the values you think it does.
<EDIT> P.S. This is more community forum than a support forum. Sometimes the developers respond but, basically, you are relying on the user community to take their own time to help out of the goodness of their own hearts.
<EDIT2> If it helps your problems is when the GC runs.
Turn off GC and it should run OK (or, at least, for much longer).
<edit3> Loop through your vertdata array. It seems not to be holding the values you think it does.