Yesterday ArcMap crashed and corrupted the toolbar layout of a map I used as model.

No TOC, the Menu bar is on the left, ... Nothing dramatic, so I replaced them to something that is more of my liking:

I saved, closed my map (to save the display in my Normal.mxt) and reopened the map. I was back at its corrupted "look"!
I deleted my Normal.mxt template. Open ArcMap, and it was ok. I added the toolbars I use the most, saved it and made a copy of my Normal.mxt.
If I open an new map, the display is fine. If I try to open any existing map (even one created a couple months ago), the display is "re-corrupted" but I know I was fine in that document.
I used a script to create 45 maps from the model mentioned earlier, so I expect to them to have the corrupted layout (didn't notice this before creating them). But I don't want to have to replace all my toolbars everytime I open a map I created before.
Never had that behavior before.
I look like it's the same question as "ArcMap changing toolbars", but I didn't find an answer there for me.