I posted about that WAY back on page 4. This may not be what you did, but if you try bypassing the issue by switching from a Credit to a Deduction, or by initially saying you want the Deduction, or by deleting the numbers yourself, Turbotax will wipe out your Schedule B (carryover) numbers. Turbotax will not repopulate them if you then switch back to Credit or say you want to use the carryover.
Fortunately, while that sheet can be difficult to calculate, just starting a new tax return from scratch, going straight to the Foreign Tax section, and then to the carryover subsection will give you the correct numbers again. You can then copy those into your real tax return.
