This really irked me, too... The ride didn't open until 2:30 because of the stupid commercial they were filming. We were all set on running there first thing, and then they told us it wouldn't open 'til mid-afternoon. We almost didn't get to ride it because of time...
I found the actual wording of the sign, too... "Occasionally, a launched train will not clear the hill. You should not be concerned; the train will slowly return to the launch position."