Ok Interesting results : i've tracked down exactly where the various recent bugs have been introduced <img src="style_emoticons/<#EMO_DIR#>/smile.gif" style="vertical-align:middle" emoid="

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I'll list the build and put the various bugs as either 'has' or 'doesn't have' - so the bigger picture on each build is easier to digest.
<b>12.1(full)+Prebuild13(base):</b>
<b>Has:</b>
1. being able to easily barter hireable officers - first instance of this, in 12.1(full) its almost impossible apart from a one or two reductions in hireing price - after that the officer will not improve the offer.
2. AI Red flag bug(France hostile)
3. 'Party Officers dissapear' bug while going to store in Falise de Fleur+extended Greenford section.
<b>Doesn't have:</b>
1. 'Double Char spawn' bug on save/reload
2. 'Decimal money' bug
3. 'Starvation escort' bug
4. 'Locked out' bug
5. 'Party Officers not using up ammo+gunpowder' bug
<b>12.1(full)+Prebuild13(base)+Update 21 Aug 06:</b>
<b>Has:</b>
1. being able to easily barter hireable officers
2. 'Decimal money' bug
3. 'Party Officers not using up ammo+gunpowder' bug
4. AI Red flag bug(France hostile)
5. 'Party Officers dissapear' bug while going to store in Falise de Fleur+extended Greenford section.
<b>Doesn't have:</b>
1. 'Double Char spawn' bug on save/reload
2. 'Starvation escort' bug
3. 'Locked out' bug
<b>12.1(full)+Prebuild13(base)+Update 10 Sept 06(on top of 21 Aug 06 one):</b>
<b>Has:</b>
1. being able to easily barter hireable officers
2. 'Decimal money' bug
3. 'Party Officers dissapear' bug while going to store in Falise de Fleur+extended Greenford section.
4. 'Party Officers not using up ammo+gunpowder' bug
5. 'Starvation escort' bug
6. 'Locked out' bug
7. AI Red flag bug(BUT only when visiting Falaise de Fleur, the fort there will fire on you when flying the red flag - game start(at Oxbay) is fine+relationship states 'neutral' from french point of view)
8. No Auto update of quest book when the Osieau is sunk(need to enter captains cabin)
<b>Doesn't have:</b>
1. 'Double Char spawn' bug on save/reload
2. AI Red flag bug at game start in Oxbay. see note above(no.7) in the 'Has' bug section for the weird thing about this.
From all this we can see the doubled char spawn bug comes in later with the actual betas. Most of the other bugs get introduced in either the August or September(more so) update file and then are continued in the following betas.
note the new(?) 'Party Officers not using up ammo+gunpowder' bug. This is something i was wondering about while testing the various betas last week, as it appeard my officers were not using up their ammo. This was added in the 21 Aug 06 update. In the prebuild13(base) they do actually use up ammo+gunpowder as they shoot. This may not be a bug of course - it might be it was decided to change this function as it can get tricky looking after your officers ammo?
oh yeah just looking and it was in the 10 Sept 06 that i got the first instance of getting 'locked out' of greenford after letting the fort there sink the Oiseau.
Im thinking if people had reported not haveing a problem in the main quest in this version it might be because they avoided triggering this bug(by capturing/sinking the Osieau in open sea).
I seem to remember avoiding this bug when i first started playtesting the betas, and the reason i think was i accidentaly changed my french flag to the red(neutral-AI/AH) one while just sailing past the range of the fort at Falaise de Fleur. The Osieau was still in range and was sunk pretty quick by the french fort, for some reason this didnt block greenford for me? Something like that - i'll test that for sure when i get onto testing the betas(tomorrow?)
Hope this helps?