I'm afraid you're going to have to change desktops for now.
Results (these are ALL on the Lubuntu OS):
Standard fresh Lubuntu or OpenBox login: MusE FAIL on multiple fronts:
Markers Editor rarely opens. Yes, I got it to open! For the life of me
I cannot determine the factors involved in making the Markers Editor
appear. (In all my tests I concentrated on altering/tweaking only one thing -
our new MDI settings.) I did this, did that, and magically it started appearing
and closing properly, but after changing the MDI settings it would fail again.
In fact, depending on our MDI settings I also could not see the Arranger at all!
I think I was able to pin that down at least.
When windows were absent I noted that I could sometimes see the proper
menus, but that was iffy, depended on various stuff.
Even WORSE: Tested MESS synthesizers (no installed DSSI-VST synths ATM):
Most of the synth windows fail to appear as well, even though the checkmarks
were clearly set.
Whew, this is... We do some custom stuff but I don't think we're doing anything
too radical here - I checked the code and ran GDB and we simply call
setVisible(true/false) on the window, and yes it's called every time I toggle
the Markers checkmark. And yet nothing happens...
Now to test the Display Manager...
I installed the KUbuntu metapackage: It asked whether I wanted to remain
with LightDM or switch to KDM, I chose KDM.
The login screen is now KDE instead of the original Lubuntu login screen.
Several new desktop choices now appear at login.
I chose 'Lubuntu' desktop from the login manager.
Tested MusE: Markers et al. still FAIL. OpenBox, KDE with OpenBox or other flavours FAIL as well.
Then I re-logged in with standard KDE desktop, and tried MusE: Success! Totally.
Then I installed Ubuntu Desktop (the Unity thingy) : Success! Almost totally:
Wow, I never tried Unity before - We got Menu problems... issues.
This might be what would happen to us on a Mac OS?
I tried Metacity but it just froze, I couldn't get past the login screen.
Let's see did I forget any other listed desktops... Well, you get the idea.
Also I may try XUbuntu Desktop as well, I'm curious now whether it will work.
As a side note: Just my bad luck: Execute a debug of MusE in KDevelop on Lubuntu
and all it does is HANG - I waited a long time. Then I tried gdb with MusE in a terminal,
and I think I found out why:
/build/buildd/gdb-7.4-2012.04/gdb/infrun.c:3189: internal-error: handle_inferior_event: Assertion `inf' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y
Crud. Unbelievable. I can breakpoint in KDevelop at places near MusE startup but after that,
continuing just HANGS.