Hi Max;
I've seen something similar to this when using complicated type defs. If
your current problems were preceded by a change to a type def that is used
in the VI that is giving you problems, then I suggest you delete and replace
all instances of the type def within that VI. Also, if you have a type def
that has a type def withing it (and so on) try replacing the type defs
withing the type defs.
This is really more of a guess then anything else, but maybe it will help...
Goodluck
Denis