Not sure if this is just me, but don't see anything reported for this...
-Found alliance
-Create an alliance ship
-(Permanently) install red trading system
-Open trade menu, "local supply and demand" tab is always blank
The other trade menu tabs (trade route/buy/sell) and the map overlay seem to work as intended in alliance ships, and the local supply & demand works fine in a personal ship.
I was able to reproduce on two different saved galaxies with no mods active.