raybaudi: 1. Invisible enemy leaders roaming around the map.
No.
Haven't seen anything alike. A few stupid troubleshooting questions could be:
- your overland movement settings are easy, normal, or hard?
I usually play with hard movement, just for the map to feel larger, and also exactly to more reliably intercept enemy leaders. They shouldn't be able to attack from extreme distance, but sometimes they apparently do.
- you don't happen to have undiscovered territory nearby? Not even on that invisible back slope of the mountain?
Sometimes the enemy leader is hiding under that single dark square. Nothing intelligent about it, just pure bad luck.
- There aren't another leader right under the one you're chasing?
The closest I can recall to this was two enemy leaders stuck at the same pixel one upon another. It was slightly noticeable because the combination didn't blink on selection as it should. The strange thing was, after I nearly killed one, the pair retreated still together, and it was only after I killed the first, the second was even open for attack, and as soon I did that that second leader reverted to aggressive behavior. That happened quite far from my colonies, I was "policing" a local conflict between two others. But I may imagine, if the pair was still in range... Then, yes, how the AI units behave, it should have stood right where your colony center used to be afterwards. Weird glitch indeed.
Anyway, my Garrison leaders rarely if ever leave the town. It's the job of Hunter class to chase the enemy, or even Pixie can do, if it's just a few wounded units.
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raybaudi: 2. Own units dissapearing from battle on advancing troops.
I had one cavalry unit vanish into thin air when there was a movement of about 4 troops into the square it was occupying. No battle rounds, no dice-roll, no resistance, just dissappeared.
Yes.
This I have seen several times. I have come to conclusion that it's just sometimes skipping over the animations of the attack. You may notice their attack count to decrease, or they turn ends immediately after it. But yeah, it is quite a "WHOOSH WTF just happened?" moment.
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Now, a few things of my own, nothing such puzzling though.
3. The ((building list)) thingy of a colony only supports up to 100 entries and
hard crash to desktop if you try to open that helper for a colony with more buildings. It's stupidly easy to get more than hundred buildings, especially in a flatlands forestry enterprise, or even easier when playing Native and filling most of it with gold mines. I love to use that list, but have trained hunch of when not to. If in doubt, I test first thing on a new turn, then at least no progress is lost if it indeed crashes. There's no apparent harm to actually having that many buildings in a colony, the engine itself manages just fine, it is just that list that got hard limit on the short side.
4. Ships with more damage than strength. It sometimes happens after naval combat. Such shops are immobile, listening damage 6/5 for example, or some such., but the still it stays on map and there's nothing you can do with it than disband it manually. No ill effects, just a nuisance.
5. Overlapping buildings. I once built a colony close to enemy one, but didn't want to destroy their colony yet, I intended to milk it with repeated raids and eventually capture. The few overlapping squares of the two colonies was good farmland, actually best my colony had, so I positioned my raider to destroy buildings there. So I did, and ordered my new farms there right away. I didn't raid them that turn again, and they rebuilt their land too, including placing a new fort partially overlapping one of my farms, by two squares. No ill effects, just weird visuals and two "saved" squares in use by both colonies.
I tried not to, but destroyed that fort in another routine raid before capturing the colony. They even managed to rebuild that territory once more, without any overlapping buildings this time.
6. Long delay on selecting "transfer to colony" option on trade screen. It doesn't happen always, but if you're an European player, have seven or more colonies and one is in considerable distance from most others (transfer times 4+ turns) that option may appear unresponsive. Don't panic, wait, sometimes over a minute, it will open and function. Right away after making multiple transfers between the same locations there's no lag. Then, next turn or from another city, it can be slow response again.