I'm playing PBEM game n° 453510 vs michaelCLARADY (+ music) where I play the Allies.
I have a supply problem in Persia. The port of Bandar Shapur (hex 223, 8) does not provide any supplies. The 7 points he has come from Basra. But in these conditions, it is impossible to go up along the railway line to capture Tehran.

I've never had this kind of problem before. Is it due to the new patch?
Thank you for your answers.