I found a resolution after many attempts at install/uninstall and a few interactions with support.
Apparently, the export process, at least for OpenFlight, executes some process that requires elevated privilidges. If when you first run 3ds Max, you right-click and select, Run As Administrator, you will always be able to export .flt files.
*Note* if you are using 3rd party applications, like 3dConnexion's Space Pilot Pro, etcetera, you will also need to stop the driver, then restart it by right-clicking and selecting, Run As Administrator. If you don't, your Space Pilot Pro will not function inside 3ds Max.
I hope that I save someone else the huge headache that this has been for me. I asked support to forward the issue and resolution on to the development team.
I was able to export .flt files briefly during two of the installations, but was unable to repeat the process that worked, until I discovered the Run As Administrator.
Before you ask, yes, when I installed 3ds Max 2011, I right clicked on setup.exe and selected Run As Administrator. Yes, my account is a member of the Administrators group. No, the account is not the "Administrator" account.
Best of luck and regards,
Brian