In limited testing, it appears that the problem is restricted to bases which have Port=0 and an Airfield=1 or 2 (as noted at the bottom of the attachment, dot bases (P0-A0) use the "no buildings" file AirBombardment_512.bmp). The file named AE Art modifications.rtf lists the files which should display depending on Port/Airfield size (graphic appended below), and this issue is consistent with a bug in which the game is using the Air11 file in place of Air01.
The solution I implemented was to replace the Air11 graphic with the Air01 picture, and to apply Air11 as a "base unique" graphic in the far fewer instances where you have a base size of A7-10/P3-6. Not in all cases, but just those where bombing is underway.
Oddly enough, I don't remember this as an issue in previous campaigns, so perhaps it's a bug which crept in during one of the later beta patches. For the record, I'm using the 26b beta and Scen 102.











