In case anyone else runs into this problem of not being able to save after scrying for the human council member and leaving the council hall, it was caused by not opening the Aleroth catacombs.
Usually if you have not restored Mardaneus' sanity before completing any of the quests that give you an invitation to the castle, he is automatically cured and the other healers move to the Blue Boar inn. Apparently the game has a problem if you have not even opened the catacombs. The possible source may be Lanilor, who gives you a teleporter stone when you open the catacombs (after you have freed him). If you don't open the catacombs he does not move to the Blue Boar inn with the rest of the healers (and will eventually get killed when Demona and the orcs invade Aleroth). When you scry for the human council member and then teleport to Aleroth, the game sets up the cutscene with Demona, but apparently has a problem if there are no quest entries for either opening the catacombs or getting the teleporter stone, or the cutscene with Lanilor has not been triggered.
To avoid this problem;
- Load a save made before scrying for the human council member.
- Take the teleporter pad to Aleroth, head to the large statue, and click on each of the smaller statues around it to turn them northward, thus opening the catacombs.
After Lanilor approaches and says he has given you a teleporter stone, return to the council of seven, and head for the room west of the gong, to get the pair of teleporter stones.
You can now leave one teleporter stone at your home base, and teleport quickly back from almost wherever you wish, then return again (drop and use the stone to get back to base, then when you are ready to continue, use the teleporter stone at your base (with it on the ground, click on it) to get back to the one you dropped, drag and drop that teleporter stone into your inventory, and continue exploring).
- If you wish you can now scry for the human council member, or you can first return to Aleroth and finish off the catacombs. You will probably not get any experience for most of the monsters there, but you will for quests (opening sealed locations, etc).
When I noticed the catacombs had not been opened in Apkairan's save I tested if Mardaneus' sanity could still be restored, though to speed things up after entering the catacombs I hex teleported to the bottom level. Apkairan determined that opening the catacombs was all that was required to get the council quest working.
Anyway, at the bottom of the catacombs, when you enter the central room your teleporter stones are disabled. After completing that area and leaving, Mardaneus shows up and provides you with a portal to get back to town. I don't know if it was because I skipped a bunch of stuff in the catacombs or because the catacombs were opened after entering the council hall, but Mardaneus didn't show up. I needed to return to town,
hex teleport into his house and talk to him to complete the quest to restore his sanity.
Originally I talked to the imp to get the teleporter stones before opening the catacombs, and after restoring Mardaneus' sanity, they were disabled. I had not tried them before then, and do not know if they were disabled because I got them before opening the catacombs, or because they were disabled in the catacombs, and were not re-enabled.