I think they changed the rule there... Last year I hit a massive parlay with them taking a three teamer all ML dogs, paid out like 4000$ if I remember correctly.....
Im sure if a few others hit similar ones they quickly decided to stop parlays, and even ML dogs it seems?
You can parlay spreads still, that's what I usually do, I tried Wash Wiz +700 as a FP, can't do any ML now, so it seems. That might be a problem during baseball.
Best ones to use were boxing bets...particularly odds for the fight to end in a draw...usually astronomical. You could easily get 80-90% of your "free" play guaranteed if you did your math right. Unfortunately Five Dimes caught one of those +3000 draw bets and that was the end of the line for me.