"I have had a value on line 10 for several years, and I've always been able to file electronically previously."
I don't think it is the value on line 10 that is causing the problem. I think it is the new IRS form 1116 Schedule B which is now required that is the problem. I assume that there is quite a bit of coding that TT must do to allow e-filing. The IRS only recently released the new Form 1116 and Schedule B.
