Strange Account/Sync/Play Store problem w/ custom roms

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http://forum.xda-developers.com – I've rooted and flashed about a dozen Androids that I've owned just in the last year, so please understand that I'm not a complete newbie. Having said that, I'm working on a US Verizon Xoom, and EOS Stingray ROM dated 2012-08-08 worked pretty well but I decided to try some other with more settings to tweak. I tried one which I can't remember, random crashes so I ditched it. Tried CM10, and got this strange problem. BAKED Black Bean ASOP, same strange problem. Here's the problem I had with CM10 and AOSP: Wiped/factory reset. Wiped cache and Dalvik. Installed ROM/gapps. Fixed perm (HowTos)