Did that. No response, withdrawal still "in process". A few days later I sent a follow up. Again, no response, nothing processed. To me, it looks fishy. Changing the way they conduct business without notice, fishy. Not transferring my money, fishy. So far they had no issue to take a four digit sum in fees, but now there seems an issue to hand over my money.
If I take what you say for face value, again, it is not entirely dissimilar to MtGox. It seems the tiny amounts and the really large amounts were handled properly for longest. The tiny ones to keep the masses happy, the large ones, not to mess with the wrong people. The ones in the middle (with the probably largest accumulated volume) were put on halt first.