The logs show that the device is enumerated and our SW is trying to communicate with it without success. The system log shows several transaction errors on USB by the Apple USB host controller driver.
"AppleUSBEHCI[0xffffff802ccf4000]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 4, EP: 0)"
Given that this issue started to happen with 1.8.1 it might be a problem in the updated host controller driver in 1.8.1, but your device is pretty standard and we have not seen the same issue.
We can try to reproduce on more systems with exactly the same device, we have it in our lab, but I'd suggest to contact Apple as well showing them the system profile.
Carlo
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