I finally got back to trying this and just started from scratch. I wanted to run Advancemame and there was some error in the manager, I'm guessing, parsing the advmame xml file. So I cheated and just typed in the path to the exe and manually selected the xml - and it worked. Hurrah.
Another thing I was able to figure out was the gamelists. It does easily import Mame32 game list ini's...well, almost. In the MaLa gamelist manager, when you import the ini, it creates a mgl for each sub-folder - but it puts the mgl(s) in the same folder as the ini! So you have to notice this, then cut and paste to the MaLa directory. Then in MaLa options>game lists, you have to name each list on the right the same as the left. Back in MaLa select refresh list for each one. Very doable, though.
Also, I was also able to get all media boxes to show to show their contents, but....
Now my questions:
1. screensaver: can MaLa run and shuffle mame games (hence the attract mode of each game will be the screensaver) ?
2. I compared with Mame32 (.104 vs advmame .106) and I'm not getting all my cabinet pngs. Do I just need to make sure they're renamed?
3. layout backgrounds: it would make sense to be able to select from a set of images right from the layout manager. As it is, it seems you have to place an image in the MaLa directory (and uncheck 'use name as directories' in options), name it to whatever the layout will be named, then create the layout. (I guess you can do this in reverse order, too.) But let's say I want to copy the layout and use a different image. If I simply resave the layout under a different name, then name a corresponding image, the layout doesn't then use the new image. It continues to use the previous image - even if I delete it from the directory!
4. can the 'safe quit' in MaLa be disabled. (Not a big deal, I'm just curious.)
5. jukebox files: I get an error when refreshing the list. (I tried both 'explorer type' and 'gamelist'.) How does it recognize these?
6. In the layout editor, I changed and saved the font color of the menu text (and also selected 'get from gamelist') but no change is showing MaLa.