Not here anymore it seems

Same. Does anyone know how to fix it?

Same issue here. Passes all tests, but the tab bars me from submitting the final solution.

Stuck with the same problem

Maybe I don't understand your post but it is you who must write gcdi. The description says:

Write the following functions of two variables

som : (x, y) -> x + y
mini : (x, y) -> min(x, y)
maxi : (x, y) -> max(x, y)
lcmu : (x, y) -> lcm(abs(x), abs(y) (see note for lcm)
gcdi : (x, y) -> gcd(abs(x), abs(y) (see note for gcd)

Same here. You can delete the tab on your test file, but internally the standard one is used.

Happening to me as well. Could somebody fix it please?