Can't seem to get upgraded to Gato, TMO2.5

Playing TMO 2.5 with RSRDC. I've been driving a Tambor since early '43. I'm now in Dec '44 and can't get upgraded to Gato. I've been thru Pearl, Midway, Majuro and now Saipan home bases but am still stuck with a Tambor. I've amassed over 100K tons and have more medals than I can give out. I feel like it's groundhog day. Anyone else have this?

I suggest that this problem should be marked as "fixed" with Annker,s fix as linked in post#30 to this thread. I've DL'd it and used it and was able to move from a Gar, to Tambor, to finally a Baleo by late 1942.