Understood...

When I said that none of my cities could build caravans, I was trying to say that the caravan unit icon is "greyed-out" in all cities...even the ones that never built a caravan before.

When I look in the resources required legend at the bottom of the build unit box, a "need trade" indicator is highlighted. This occurs suddenly, even in new cities despite the fact that I had previously been able to build the units.

When this problem first appeared I deleted my game and began anew.

This has happened 3 times so far. Reloading the game seems to make the problem go away (even in a saved game, which seems to imply a problem with the game engine developing as I play...), though the problem can re-emerge in a saved game even after reinstall. Could this be another facet of "memory leak"?

Consort

Yes, if you're losing access to trade after researching it, please upload a save demonstrating that behavior to drop.io and link it here.

Actually I've had the opposite problem with conquered cities -- they're allowing me to build and use multiple caravans!

Hail Gent....happy newcomer to the game and the forum.

I'm wondering...how do I get to produce a caravan from my first 2 towns??  My first one is kinda big and has a merchant tile built...why can't I build a caravan already? 2nd is smaller but coming up and I want to set up a "trade route" between the 2.

I am playing my first campaign game btw so have only visited the first 2 "allies" at this point.  Any help is appreciated.

I realize this is still a work in progress ...will probably be an amazing thing when it comes to fruition...but yikes on the UI (and I have played a LOT of games heh).

Cheers and I look forward to both glistening and abusing the forum and community going forward