I've been away this week, sorry for delay.
"Eco trader"
It's short for 'economy boost'. In eco mode the trader prioritizes selling wares to stations that aren't producing due to ware shortages, rather than focusing only on best profit trades.
1.6.2 ... The station based traders would not keep any EC after selling some EC.
When unloading wares at the homebase in 1.6.2 traders also unload all jump energy (if the homebase uses energy). This is because the trader has no mission at this point, and so needs no energy cells.
When it selects its next mission it should then load a quanity of jump energy, particularly if the destination is in another sector. 1.6.2 is all about trying to optimize down the amount of energy the trader ships to make room for more traded wares.
If your trader has a jumpdrive, homebase has energy cells, is travelling outside of the home sector, and is NOT loading any jump energy from the homebase, then that may well be a bug.
I'll try and repro this the next time I have a window to play the game. Another way forward is to send me logging for analysis:
1. Select this trader as the logging target
2. Move trader to homebase, don't start OK Trade yet
3. Enable level 9 logging - be sure the trader is selected as logging target or log will be spammed by all traders
4. Start OK Trade on the trader
5. Wait until the trader selects a trade mission and heads out
6. Capture the log at this point (C:\Users\<User>\Documents\Egosoft\X3AP\log09055.txt)
7. Examine or PM me the log
reinstalled the 1.6.1...freighters were loosing their freight magically.
I've no insight into this. OK will load/unload at homebase or buy/sell outside of it. If wares disappear I'd expect them to have been unloaded at the homebase or sold to another station.
Downgrade without uninstall can potentially result in instability, it's not a case that's worth investing my time in supporting. That said I don't recall having made breaking changes in 1.6.2.
I think logging would be the way forward here too, if we can compare OK's decision making to real actions that occurred. E.g.went to homebase, wares still appear in cargo, undocks from homebase, wares have all disappeared) -> enable logging before it docks at homebase, and collect the log after confirming wares disappear from cargo.