The crash in the FULL could be a number of things. You'll have to do some good old testing!
First, try holding the right mouse button on boot and booting into a Workbench environment (like the LITE) and see if it stops the crash. If it doesn't, it might be FBlit related.
Next try and enable or disable some of the patches/components under the settings or tools menu.
Finally, have a look at the Scalos prefs/settings. Perhaps it's a setting like the default drive feature (Scalos is able to give each device a nice looking default icon) that is causing the issues.
It's always fun and games with the Amiga.