Problem still happens. I changed (1) leg of a ticket and ended up with a $26 balance. I applied travel funds for $12 and used a credit card for the remainder and got the same error message. Until I removed the travel funds it would not go through. Very annoying. I did call customer service and put in my number for a call back - but it has been over an hour so I removed the travel funds and it worked. Guess I need to find something else for my $12 of funds