I've read that people got crash on different units. I had only problems with orc_saboteur but I resolved it and so I'll share the procedure.
I made a copy "orc_saboteur.atom".
Then I just copied everything from "orc_hunter.atom" to "orc_saboteur.atom" except from the model; I tried the unit and I experienced no crash, obviously
.
Then I added something from the original "orc_saboteur.atom" to the new one and made other check...no crashes.
I managed to recreate the Orc Saboteur adding "posthitmaster", "posthitslave" and all 3 special attacks; I added animation for "evade" and sounds for "evade" and "telein"/"teleout".
In the end I have a fully functional Orc Saboteur, without knowing what was wrong with the original one, the 2 files are almost identical, mine being 6698 characters instead of 6722 of the original, but I've no patience to go through the files and search for differences.
Hope to be helpful for someone.