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The person who answered wasn't the person who disabled it, he was just guessing.

I prefer the term educated guess, and I verified that it was the reason after saying that. Yes, both are disabled due to issues with crashes.
 
Me, Bottiger, and Zebra found a glitch with the Red Tape Recorder in which it could be used to crash the servers. Therefore Bottiger disabled it until Valve fixed the problem.
 
So is the Ap-Sap going to be allowed or no? If not, I'll just have to stick with stock, but I love Wheatley..
 
I think I see what happens. When you are in range of a building with a sapper, there is an image of the sapper projected onto the building. Obviously TF2 can't handle when two spies with two different sappers come in range of a building with their sappers, as it freaks out because it can't draw two different sapper images at the same time on the same building. Obviously not an issue when two spies are using the same sapper, but probably an issue with any mix of two different sappers, like the regular sapper and an Ap-Sap, or an Ap-sap and a Red-Tape.

This is Gaben's fault.