Well, let's start with the Galleries.
And let's begin with your end : randomizing the Playlist itself -> that's ok with me. Not difficult either.
About the empty jpeg, hmm ... I will try it with you provided example. Note though that it was you who saved that file in the first place. Not XX or Amazon etc. So in the end I don't get what happened and/or what you did about it. Note that the data obtained from Amazon must be explicitly saved (the yellow bordered items).
But thanks for finding the cause. I will make it proof to that anyway.
I created a test gallery with just 3 albums. This went ok although I find the procedure slightly involved for the average user but never mind (first open Library tab, click & select 3 albums, select 'add to gallery', go back to Settings, change Music Root to newly defined gallery folder, go back to Library tab).
Yes that looks tedious. I'd be the first to agree. But ... somehow your approach to, say, "playback" is different from others. I'm not sure where it comes from, and probably it is justified (why not), but it is not how XX has been setup. I mean (in general that is) : you seem to want to create playlists explicitly and physically, but this is not what is being done, and at least I never do it. Ok, I did, when the Galleries weren't there yet ...
In fact I think I explained it in my previous post, but probably you have it in your mind somewhat different and now it doesn't come through. What if I say this :
Playlists as such indeed are being made, but not saved. Does that help ?
So, what you got from my post is creating Galleries in order to act as playlists, or something like that. And yes, when done like that, it's a tedious operation. Of course you *can* go about like that, and most probably it was implied by me as an answer to wanting to have playlists, but still the rule is : "... but not saved". Remember what I told earlier about myself : I wouldn't like to listen to the same tracks over and over. So why save a playlist ?
Maybe I'd better explain it from another angle, and tell what the Galleries are for;
The Galleries are there to group your albums to whatever angle you want, and one album can be in as many Galleries you like. For instance, a Miles Davis album could be in Jazz as well as in Male Singers at the same time.
Looking at your example structure it looks wrongish to do everything you want to do with it. It should be
XXHighEnd (as the main root for music data)
--Pop
----Abba
------Best of
------Gold
----Beatles
------Nr1
------Yellow Submarine
----Steve Miller Band
------The Joker
--Ambient
----Fripp & Eno
------KaZeMa
--Rock
----Steve Miller Band
------The Joker
Note that the only entries you made explicitly are XXHighend, Pop, Ambient and Rock. The others just emerge by appointing the the albums to an entry like Rock. Thus, appoint The Joker (which is somewhere on disk) to Rock, and the remainder of the structure emerges automatically.
What I pointed out in the above is not new, and otherwise you will say "yea, I could make that up myself". True. But the merits of this structure are much more rich than your example. You now can :
Select the main XXHighEnd folder. And indeed, this is not allowed by clicking on it, which you can do for everything else. So, since XXHighEnd is the root, it will be shown in the textbox at the bottom, and it is a matter of removing the right part and click search. Note that after this it's in the Favorites (F button) and you can select it from there. Btw, this is what I personally almost always use for a source (and hardly the Rock etc. folders).
When the structure is like this, you can click Pop, Ambient etc., and there is your list of Pop etc. albums.
Might you have a pile of Pink Floyd under Rock, then you'd see that at traversing down from Rock to Pink Floyd, you can click the Pink Floyd folder, and there are all your PF albums. Or click one. Or click one track (this latter is always dangerous because it takes explicit attention by me because of some redundancy there).
Now it is the whole point, that whatever emerges in the Library area, it can easily be narrowed down by typing in the textbox next to the Search button. And try to keep in mind, when I ask for your "XXHighEnd" folder, 12000 albums pop up, or some 150,000 tracks for that matter. So, no matter I selected unaccording the type of music (hence I selected nothing), at typing Pink F ... there they are instantly. Including a few classical covers this time.
Note that I also could type ABBA in advance, and *then* start to select from the embedded explorer. Only things containing ABBA will show up.
There are many more things for narrowing down (like date creation), and they are not difficult to find.
But now back to the subject : with these facilities at hand, why would one ever need to create a *saved* playlist ?? I just don't get that, never mind it will be justified to want it. But since it is (as perceived by me !) not needed, why go through the trouble.
But you could try this too :
Whatever you have in the Playlist at a certain moment, and no matter how it emerged there, if you like it as a playlist, you can select all the tracks, and rightclick - save it to a playlist you create on the fly. This is less than 10 seconds work. This playlist as I see it (and wich kind of was the angle I talked from in the previous post) is a Gallery with all its faciities, and once asked for via embedded explorer, you again can select and narrow down as usual.
Josef, it seems you know a bit more from IT stuff than average, and it should not be difficult to get the merits of this. But you forgot one thing : setting up your music library in the first place. You just don't have it, although you have albums on disk somewhere of course.
Keep this in mind, because I think it is important.
Another thing is, I'm afraid you never got to listing your physical albums in the Library Area. Just -again- select a root folder to it by means of that same textbox at the bottom, and they will all show up. This is your base for creating Galleries. You most probably already will have a Pop and Jazz etc. structure. You can just use it from there, select that Jazz, next select all the albums showing up and create a gallery Jazz from it under that XXHighEnd Gallery folder. And when you're at it, press the R there. It will work. But what it does is bringing forward albums (or tracks) in the visible area. That won't work with three only, because all three are already visible ...
Now, if you look at the pile of text above, I can very easily type a 10 fold of this to explain all about the Galleries. Easily. And it has to be done for the manual the upcoming time. I only want to say, there is much much more in there than you'd expect, but look a bit through IT eyes. Not everybody can do that, you can.
But randomizing the Playlist itself ... it can be done. Why not.
Peter
(not checked for typos)