My checks are all matching yours.

The error appears to be in the inability of MT4 to read ZorroMT4.ex4 from the shadow folder even though I can clearly see it sitting there. This is occurring with downloads from two different brokers. Of course, this shouldn't make a difference. Just saying. It works on a previous Build 509 that was updated to Build 600. It does not work on a fresh Build 604 installation.