Is there a trick to get this mod to work? When I click on a propylon, instead of a dialog box asking if I want to go to next all I do is get transported back to Caldera.

Talk to Folms Mirel and tell him which stronghold you want to be sent to

No, that's how you activate Bethesda's original plug-in. The UPGRADE made by Garren is supposed to allow you to move between propylon chambers directly - as you did originally - OR to go back to Caldera.

Here can you ask the http://www.gamesas.com/index.php?/topic/1066148-master-index-upgrade/ directly.

I think I got it fixed: the Upgrade needs to be loaded AFTER the Master Index plug-in and the newly released MLOX solved this in a flash. Pretty slick tool - but it looks as if the guy has earned himself a full-time job trying to keep up with all the various MODs and their individual quirks.