I've got the same smell. Took car to the dealership (Sewell Infiniti Dallas) and asked to have the cabin filter changed. They also ran some cleaner through it, I could smell it strongly the first day, lightly the 2nd day. Now 3 days later I smell the moldy smell again.

Will try running the A/C with non-cooled, outside air a minute before shutting the car off, but that's a pain in 102 degree, 90% humidity Dallas...

None of my other 10+ cars have done this.

 

its normal condensation...its worse when i use the fan after using the AC.