I`m playing Alpha Centurai, on a large custom map, and now i cant get any more units made, If i hurry production, the game is happy to take my energy credits and give no finished production.
I only bought the gog version (fully updated) because i thought they fixed all these issues.
I already owned the original version using the official and unofficial patch, but now ive forked up more money for the same game and don't see much improvement. I`d love this game to work properly. Anyone know of a fix to get production working again?

The game is not coded to allow more than something like 2000ish (2000? 4000?) units. There is no coded space for your new unit. How it is that you are not bored with a map that large I do not know. The AI is not good enough to be worth more than a skirmish. What are you doing? Grand strategy requires grand AI, and Alpha Centauri has never had it. Play a smaller to standard sized map, maybe you will get a challenge playing against the Spartans.

GOG's products are ports. Even if they had the money to engage in such projects, GOG only receives permission (unless the game is already available free, maybe) to make sure the product is transferable to new platform. If you want a modern product, petition EA to drop dead so that someone can make a sequel. Or look at the new Age of Wonders 3. I try to give people snarky responses on that forum also.

If you wish to explain to me why you need a map that big, I believe I can entertain it.

I believe the limit is currently 2048. The first version of Scient’s unofficial update attempted to increase the number but this actually resulted in crashing the game, so we’re stuck with the limit for the time being. The next version of the unofficial patch probably won’t do anything but roll back that change but he may be able to increase the limit at some point in the future.