Actually, there were a number of books where the line for Chi/Minny game was off, so no surprise that Proline didn't have it.
What really sucks (other than their payout odds) is when books have a team at -3 and Proline has them at -3.5. I know that's to their advantage, but pisses me off when they bump it just past those magic numbers. They tend to do that with a lot of games where books have teams at -3.
However, like I mentioned in another thread, sometimes you will find a line to your advantage, though rare. For example, Atl was at -3 on Proline today while the books had them at -1 or -1.5. Now THAT was a gift, especially if you liked TB SU, even though they didn't win SU.