A month further, since I have been 3 weeks away to The Philippines, this problem still persists:
First I removed any MUI related files in maps where they should not be. Then I installed MUI again and make sure it got installed in SYS:MUI (or DH0:MUI or Workbench:MUI), there are multiple terms for this map. I checked out the user-startup and it makes appearantly the proper assigns to MUI.
Also used Snoopdos to check what is going on, but STILL iGame does not load and Snoopdos says "Failed to load muimaster.library". I am using MUI 3.8.
What is going wrong here? MUI makes these entries in the user-startup itself so I suppose the assigns are correct. So why won't iGame not find muimaster.library? It's puzzling, and frustrating. I wish that there was a 'ready made' LHA file containing all the items required and that all of this, whdload + igame + mui + extra needed files could be installed in one go.
Suggestions anyone?