Just started a game using 3.03 and is still happening. Also AI is still wasting starbases on merc stations.

Diplo screen is no where near representative of actual relations ie the difference in shown positives and negative rarely seem to equate to actual relations which personally I find quite annoying

Another nice thing would be either having the governor off all together by default to stop auto upgrades or have it come up on planetfall so we can set it. So many times I lost a planet for a century doing upgrades that suck up valuable resources (and production) on tile improvements that where just placeholders while I tech up.

Edit: Just had an event to give +9 diplomacy and 100% range to everyone's ships (benevolent option). Only thing that seemed to occur was 100% range for me which was the pragmatic choice (still got the right ideology points).

So why have a sense of scale to it? I know it is not totally representative of relations, and I have come to terms with that a long time ago, but it is something that could use a little work in my opinion to just bring it a bit closer to expectations. And with the +9 diplomacy, still yet to see any effects along with no change for range.

Playing the 3.03 opt-in as the Terran Resistance I can build the Import Export Center twice. With other civs that happens with other player unique buildings also.

In 3.03 Intrigue the AI still does not know how to use the special government ships like the Prefect.  Instead of putting it in orbit to get the +5 to all construction, the Altarians are flying it around the galaxy as a scout.

Is it intended that farms do not benefit from adjacent buildings that give +x to Population?

TreatyDefs.xml for those types (but not exploration) has a line:

As to whether it does anything or not, I don't know.  I'd try it out, but in my current game I have horrible relations with all the AIs and I can't offer a treaty to them.

Hm, if Exploration treaty doesn't have the two-way line but works one could assume that treaties that have that line don't work ...

Seems like I have to try it out, my relations in my current game are good enough for that.

I just established a Research Treaty with the Altarians and can confirm that nothing has changed. Although the tooltip in Treaty Detail states "Give a 25% bonus to research of both civilizations though [yes, typo] the sharing of Technologies" I cannot anywhere see that bonus applied to my research.

True.  I found the a copy of the old Two Way Treaties mod and it added a <GiverModifier> section to those treaty types.

Something else: in my current game the last few trade offers I got were from weaker civs with good relations, and all where of the kind "I pay you 175 bc + perhaps a tiny bit on top (like an exploration treaty) and you give me all your techs and resources". There must be something off in the trade logic when certain conditions (that I not know ) are met ...

This happens all the time, also with other player wonders like Computer Core and Central Bank. So far I was unable to determine a pattern, but it could possibly have to do with loading a savegame.

If would be fine if it only happened after conquering a planet that has such improvements (when you destroy those and then rebuild them somewhere else). But it definitely also happens without getting them first from another civ or minor race.

I hear you, but just to be clear I said that it is possible that there is a bug. But, what I disagreed with was the statement that the AI ignores the range system. Having stepped through the system in code I know the AI is using it (it would have been so much easier just to have the AI ignore it, but the programmers worked hard to make sure the AI follows the same rules as the human player). But again, bugs are always possible.

The AI is ignoring the extra movement cost system.  See this post for some information.  You can also check old tickets MHL-559-75712 from August and BKL-489-10361 from December.  They are from older versions of the game, but at least one of them includes a video showing the problem.  I have always wondered if the same bug causing the extra movement cost problem was also causing the range problem.  In both cases the AI is/was ignoring the restrictions that a human player has.

Also, if I start a game and have the extra movement costs applied to my ships, then go into the console and use the "ai" or "soak" command to let the AI control my ships, my ships start ignoring the extra movement costs.  If I wait a few turns and then take back control, I have to pay the movement costs.  The extra movement costs are not applied when the AI is in control.