Heath,
Page 7 of the DR5033 manual shows that you turn off LNCV bit 6 labelled "Automatic polarity reversal off". It comes on by default. No insult, but how did you miss this? :) I've noticed that I tend to not find things when I search in hope. When I search knowing it's there I often succeed. I must be getting too old for this.
And I can also confirm what Jay Lennox has said about keeping all your DR5033's track outputs wired so that they never want to reverse the polarity. Turning off bit 6 will force you to have it wired properly.
Oldngrey