So it is just a minor database issue, rather as I thought in the first place. It is odd, in that usually I withdraw airgroups a little early as allies, it garners you political points, and quite a few at that. The airgroup was based on the Hermes, if I remember correctly, and it got caught by a flock of Betty's opposing a Japanese attempt to reinforce Akyab. I then sent it to Colombo for repair, and missed that an airgroup was ready for withdraw. I only attempted to withdraw / disband it after it was past due.
This does raise a couple of issues in my mind, which is why I posed.
1.) Is this an issue only with Scenario #9, or all the others? If it is all them, then I would have thought that this would have come up before now. If I had not missed the withdraw date, would there have been a problem? Big, or rather HUGE database, lots of potential burps.
2.) Is this a political points exploit? According to the Ops report and intelligence screen, I get 16 political points deducted each turn, but can reap an unlimited amount just by repeatedly pressing "withdraw group". In a serious PBEM game, well you get the picture.
Thank you both, and Happy Holidays to all.