absolute check rejected by credit union

[dpis]

I received check 2 days ago from a payment center on behalf of Absolute, deposited at my credit union and the money was in my acct. Got a call from CU today saying the check was from Canadian bank and that they could not process it. I can go get it or they can try to send it off for a 4 week process of cashing it themselves, for canadian-to-US value (???). Anyone know if it's a credit union issue? Should I open acct at a bank, if so which one? I've received lots of checks from absolute and never had a prob before, but I do believe all were US based banks. E-mail absolute and ask for another check drawn on US Bank? Any help is appreciated, thanks