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Are there any workarounds?
Edit: It looks like I've found the reason - trying to book the return >330 days from today.
Note to Etihad's IT people: Is it possible to identify such an error and put the advice in the error message?
e.g. :We are sorry, but we cannot arrange tickets for dates more than 330 days from today's date"
Since the Etihad booking page doesn't bring up a message about dates exceeding 330 days into the future, just keep the booking window limit in mind - when you get an error message like the one in my first post!
Interestingly the website doesn't black out the 330+ day dates, which I would have expected would avoid this problem.
FlyerTalk tip (this thread from MileageAddict): use this site for working out +330 days for bookings or -330 days for redemptions!