Please insert Volume DH1

[Matt_H]

There's probably an assign or a configuration file that's looking for something on a partition called DH1... which I'm guessing isn't part of your UAE configuration.

[Matt_H]

... Installed this some years ago also, and back then I didnt have this problem :-S

Then i'll just make a clean install with my WB 3.1

A clean install won't solve the problem (unless, of course, you don't install the ClassicWB pack afterward).

You need to configure your emulator to have another hard drive partition named DH1.