Not quite sure what the problem is... but...
Try typing Assign (return) in a shell window and see what devices are mounted, in particular look for an "HD0" reference...

Could be that for some reason the "ToolTypes" in the icons you are clicking have "HD0:" in them and not "DH0:" as you require...

The only time you usually get "HD0:" showing up is when you first format & partition an HD in HDToolBox but most folk change this to the more traditional "DH0:" for the Amiga...

It would also help to check your StartUp-Sequence to see if any Assigns have been made there referring to "HD0:"...
