The biggest news (concerning this forum) is that VICEplus has joined with VICE and 2.1 includes x64dtv. The development of x64dtv will continue on VICE, and VICEplus has become obsolete. Get the latest VICE for your DTV emulation needs.
Can't test right now, but could you try deleting (or renaming) vice.ini and restart. There has been quite some changes around the sid engines. After this, check that reSID and DTVSID (reSID) is selected in the sid settings dialog. (i.e not reSID-fp)