EXCLUSIVE

"Transparent" is a forward-thinking show about transgender acceptance, but the kumbaya spirit stops at the bathroom door.

Sources connected with the production tell us, members of the crew are up in arms over the unisex bathroom on the set.

We're told the brass changed the drill ... from now on both bathrooms are open to all, with no restrictions. Just come on in and do your business, regardless of who's there.

Check out the sign -- it shows women and men ... and the symbol commonly used for all-genders.

The beef is that men, women and transgenders can all enter as they please, making it uncomfortable for some of the crew. Women are particularly worried about walking in and seeing a dude peeing at the urinal.

Now this is interesting ... we're told several crew members are too scared to complain, for fear they'll be labeled "transphobic," which would be the kiss of death on that set.