Also tried:

Removing entire Log folder. Same problem.

Removing entire History folder. Zorro complains about not finding AssetFix.dta, but still allows Trade to be pushed. Same problem.

What is the fxcm dll interaction between Zorros? At about the 5th dot on the Z3 Zorro, the Z12 Zorro window shifts slightly and stops updating. It remains frozen until the Z3 Zorro (which continues printing dots) is killed, then returns to its original position and resumes updating. Sure seems like a dll/api problem...

FXCM will not assist further without API logs...

Thanks.