Express on Emphasis: dimmers run up, but not down...

So, I've recently moved High Schools and my new gig has an Express running on an Emphasis Server.  I've had issues with the the board being able to bring up the channels, but when they are lowered again, the dimmers don't lower, or only lower a little.

 

Before you ask: no channels are parked, the channels read as released, but the dimmer is obviously on, and the Sensor+ rack reads signal.  I know that the Sensor has the Highest Takes Precedence (HTP) protocol, but the issue is that nothing else is plugged into the system, other than the Unison system for the House lights.  That system is working fine, it calls up and down the dimmers without issue... so it must be in either the Expression, or the Emphasis...

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