this doesn't help!
I'm finding this very frustrating! Despite having created presets, when I make a change to the page, the editor 'loses' the default contants it should be updating. I then go back into edit the settings, apply the correct field, then when testing I get the "Toolbar 'Custom' does not exist" error. I then try to change it to one of the presets, but it fails every time. I'm really annoyed about this, as I only wanted to make a minor change and have so far wasted three hours trying to correct something which should work properly straight out of the box!
I now have numerous presets listed, but none of them work if I try to apply them -how do I get rid of them so I can start from scratch (yet again!)