I am having this issue as well.  No errors in the return when I do the check but gets rejected when trying to e-file due to a problem with the Form 1116.  My client does have foreign tax credit carryforwards.  I have seen a few people mention that it might be the carryovers causing the problem?  I haven't seen any posts on this issue in the several weeks so am wondering if there is a workaround or something I haven't seen?  I am current on all software updates if there was a fix.