I know this doesn't address a potential bug as you describe above, but have you tried using RegularLabs' "Advanced Module Manager" ?

Thanks David, Yes, definitely interested. I've had a cursory glance. I notice there is a paid version and a free version. What you are suggesting, would that require the paid version or the free version? I ask because I don't trade and costs are already coming out of pocket.

I notice there is a potential to force modules to display on strict assignment rules - how would you envisage me accomplishing the result above as I have never used Advanced Module Manager before?

If you would be kind enough to give me some more in depth instructions, I would be happy to test it out on a copy of the existing install? The other question is, how would I go about changing my existing setup to take advantage of this - for example, could my current viewing access arrangements and viewing levels conflict with any configuration of Advanced Module Manager?

Thanks again.

@greenlanegreb You may want to post your question in Regular Labs Support Forum to get an answer.

Ah it turned out not to be a bug. It was just the way that Joomla does things. I messed around and found out how to sort it out. I have set up two groups that have their own menu items visible to them - IT and Business. Where I have used these, obviously people can use what they like.

1. Install Joomla

2. Install Gantry Framework (optional)

3. Make Sure Both Are Up to Date

4. Create User Group IT with group parent set to Registered.

5. Create User Group Business with group parent set to Registered.

6. Create Access Level IT - Set User Groups Having Access to "IT"

7. Create Access Level Business - Set User Groups Having Access to "Business".

8. Create User IT - assign "registered" and "IT" in user groups tab.

9. Create User Business assign "Registered" and "Business" in user groups tab.

10. In Article Manager, create "Welcome - you are not signed in" page - assign viewing access to guest (no need for people logged in to see this unless they are logged out).

11. In Article Manager, create "Welcome - you are now signed in" page - assign viewing access to registered (so that all of those logged in can see it).

12. On Main Menu, Link main menu item to "Welcome you are not signed in". Make the menu item visible to the "guest" group (available by default).

13. On Main Menu, create new menu item for "Welcome - you are now signed in" - assign viewing access to registered.

14. In default Joomla login module, set login redirect to "Welcome you are now signed in" and also ensure that the module is assigned to all pages (because users also need a logout functionality that comes with it).

15. Create a new menu "IT" - create two test web links so that Joomla has the ability to display the menu module. Assign a module to it and set viewing access to User Role IT. The test links should also be set up as visible to the IT group.

16. Create a new menu module "Business" - create two test web links that are distinguishable so that Joomla has the ability to display this menu module to. Set viewing access to User Role Business. The test links should also be set to only be visible to the Business group.

17. In Menu assignment, Assign module created for "IT" to display on "You are now signed in" page linked to the main menu.

18. In Menu assignment, Assign module created for "Business" to display on "You are now signed in" page linked to the main menu.

It would be nice to have an ability not to have to have the logged in redirect item as a main menu item and simply be able to assign modules to appear in the event of a login.. This would simplify matters significantly. Guest is also not particularly clear since there is also the public option.