In case anybody still cares...
Apparently the problem has been solved, though in an awkward way. After some personal troubleshooting and help from my reseller, the solution is as follows:
A couple of libraries need to be loaded INDIVIDUALLY!!!!! You can't just select a directory and have AC automatically load each library in there. VERY counterintuitive. The libraries that I have (need to be?) installed now are the following:
1. <DIR> [BImg] Background Images
2. <DIR> [TImb] Textures
3. <DIR> Lightworks
4. <DIR> List Templates
5. <DIR> Patches
6. AC9 lib for SE9.PLA
7. AC9 Library Special Edition.pla
Any deviation from the above minimums will result in the crash when selecting the "Set Up List Schemes..." option. I tried linking up each directory individually to localize the error, but got inconsistent results. At one time it crashed only after adding "List Templates", but the next time it worked after working backwards and installing each subdirectory individually.
So much for having a clean library tree...