QA to investigate

are you absolutely sure this doesn't apply to 7.4?
I haven't had a chance to try whether this is a Fab4 only bug, I reported it against Fab4 because that's where I noticed it.

I need to verify this against other SP based players, if I can repo it there (or if you can) then it can be reassigned to SP and targeted for 7.4

OK, reassigned to baby since it doesn't work there either.
On Baby I don't get ANYTHING on the screen when entering the Napster menu.
I think this is critical since it simply means you can't use Napster, I can't re-assign to 7.4, though (not available).

OK, in the next step I was able to reassign to 7.4

if it's both Baby/Fab, then it's a SP bug.  reassigning and clearing time

One more hint:
When I request a menu for my Fab4 with iPeng, I get an "opmlnapster" item on the home menu, which then leads to a textarea window that in turn leads to the new warning menu (see below).
This new menu is the one that seems to be troublesome on Fab4, maybe you can't move on from a textarea window?

OTOH, I DON'T get that home menu item for my Baby, when I enter "Napster" on Baby I just get nothing at all.

All my other configured "Apps" work from the home menu.

Home menu item:
            {
              actions => {
                    go => {
                            cmd => ["napster", "items"],
                            params => { menu => "napster" },
                            player => 0,
                          },
                  },
              displayWhenOff => 0,
              id => "opmlnapster",
              node => "home",
              stringToken => "PLUGIN_NAPSTER_MODULE_NAME",
              text => "Napster",
              window => {
                    "icon-id"  => "plugins/Napster/html/images/icon.png",
                    titleStyle => "album",
                  },
            },

1st Menu delivered:
  {
    channel => "/e00013e0/slim/request",
    data => {
          count     => 1,
          item_loop => [
                         {
                           count    => 1,
                           offset   => 0,
                           text     => "READ ME",
                           textArea => "Please upgrade your firmware at:\n\nSettings->\nController Settings->\nAdvanced->\nSoftware Update\n\nThere have been updates to better support the communication between your remote and Squeezebox Server, and this requires a newer version of firmware.",
                           weight   => 1,
                           window   => { titleStyle => "settings" },
                         },
                       ],
          offset    => 0,
        },
    ext => { priority => "" },
    id => 63,
  },

Andy will investigate this to find the root cause

bug 12484 may be related

Is this still an issue?

No, works now with SC.

This bug has been marked as fixed in the 7.4.0 release version of SqueezeBox Server!
    * SqueezeCenter: 28672
    * Squeezebox 2 and 3: 130
    * Transporter: 80
    * Receiver: 65
    * Boom: 50
    * Controller: 7790
    * Radio: 7790  

Please see the Release Notes for all the details: http://wiki.slimdevices.com/index.php/Release_Notes

If you haven't already, please download and install the new version from http://www.logitechsqueezebox.com/support/download-squeezebox-server.html

If you are still experiencing this problem, feel free to reopen the bug with your new comments and we'll have another look.