There are a lot of problems with 9.0 It was a major rewrite of the back end. Things which should work are getting broken. The rewrite was necessary, but I think that 9.0 was rushed out the door too soon. The Powers That Be chose to deliver on time rather than bug fixed.
WorldShips 2 through 4 or 5 were downgrades for Online Pro users, but at least they installed and ran correctly. WS9.0 is bad enough that UPS has officially put the deployment on hold and sent messages to pop up on the systems still using 7.0 and 8.0 asking them to NOT upgrade.
They put out a system that's riddled with bugs and cause way more problems than it fixes. We let everyone install it, it tanks and halts production, then they send in the flying monkies (TSG) to take all the heat.
I'd wish UPS would finally realize that they're a package deliver company and not a software development studio.