Auto setup didnt fail for me in the same way you experienced, but it did grossly miscalculate speaker distances. My front 3 speakers are 12 feet away but auto setup said 32 feet ! My surrounds are 6 ft for the side walls and 7 ft to the rears. It reported both those in the 30ft range also. Ran it twice with similar results. Never did figure that out, so i setup manually.
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Double drywalled, "Green Glue" treated Theater
GIK acoustic treatment
Epson 8700UB Projecting on a 135" Seymour XD Audio transparent screen
Outlaw 976 Processor
Outlaw 755 amp for Center and all four surrounds
Adcom GFA 555II for Main L & R channels
Behringer EP4000 for two homemade subs
Outlaw Ultra X13 for REAL Sub Bass !
OPPO BDP103, Marantz CD63SE, Denon DP300F
2 Adcom ACE515s for AC current treatment
Newport Theater Director for AC distribution.
Speakers are all built by myself utilizing Dynaudio Drivers
Second room: Yamaha receiver, Musical fidelity X10D tubes, Carver C9 holographic pro.