My question is, did deleting the Bglman(s) fix my problem, or could something in the KFLL package create this problem? Thank you for the great scenery, I truly enjoy flying into & out of your airports, FPS average 50-70.
I'm not sure to have understood the question. You said yourself that, after reinstalling FS9 from scratch, you were able to complete a whole flight without problems so, it appears your problem has been fixed. It was probably inside FS9, since you said that reinstalling Windows didn't help, but reinstalling FS9 did.
However, the whole point is that your problem was not caused by bglman.dll in the first place.
- If you had the old version, it would not run on Vista 64 at all.
- If you had mis-matched files coming from different version, it would not crash after some time, but it would quit from FS9 at start
And, as you said yourself, by reinstalling everything from scratch, works ok now. So, it's clear that your problem was not related to bglman.dll in any way. The fact you reinstalled everything from scratch, has probably fixed something else, either in your Windows installation or in your FS9 installation, that created the crash after flying for some time.
And no, the fact that it started when you installed KFLL, it's no indication the problem is KFLL, which is obviously clearly demonstrated by the fact that, after a total reinstall, you are now able to use KFLL without any problems.
Also, the steps I've outlined to correctly install the sceneries, are usually not needed. It should be more than enough to just install FSDT after Cloud9, I simply added the "manual remove" step, to be absolutely sure that nothing could interfer with the correct updating of the files, but it shouldn't be necessary, under a normal, working system.