Yeah, seeing the same problem with v3.0 on my iPad. No amount of removing / re-adding gets around the error (disabling/enabling device sync and a full, clean app reinstall also doesn't help) - if you sideload into library\eBooks, it won't open , and it also doesn't display embedded covers, incidentally. If you move the epub to Documents, it all works (without sync as per usual). If you send via personal document service, it works with sync for Kindles and iOS (and probably PC) - but here's the rub (for me at least); there's no personal document service for the Android app, you just can't target an android phone it seems.
Major bummer, I used to have page sync between my two primary reading devices... an iPad and a Galaxy Nexus. Eagerly awaiting any rockstar tricks to get it back.
