The Lighting Controller

An opto-isolating splitter is never a bad idea especially for long DMX runs of I find any longer than 250 ft. If nothing else it will protect your hub from possible DMX spikes from fixtures.
Did you do what tomrbland and I suggested about trying a fresh re-load of the software?

I am going to try both. Basically reload the software and use the Data Stream 4 to break up the groupings. Hopefully it works. I won't know till friday night when I get to the location.