Ok, downloaded snoopdos and gave it a go. This is what it spat out when loading OSS:

Trying to open the command shell didnt add to the list (which isnt a good sign) but by the looks of things the lib files that are failing to load on start-up could very well be the cause of the problem..
Just press the "Functions..." button on bottom right of Snoopdos screen and in there you'll see a heck of a lot more functions that can be selected for monitoring....select the whole lot and then see if it still misses the failed Shell.

Yes, I know you've fixed it now but just incase anyone else doesn't realise this I thought I'd best mention it. Snoopdos should be standard equipment on any Amiga.
