If you are running from the internal SD, make sure you chmod the relevant files. I went a bit overboard and chmod'd everything in the Vice folder and also everything in the C64 sub-directory. Or if you run it from the external SD, you don't have to worry about chmod'ing at all.
x64.dge runs well for me now, enjoyed a bit of Enforcer last night (by Manfred Trenz, creator of Turrican).