When using v2.1.5/v2.1.6 on a Compaq Deskpro with Adaptec 2940 SCSI card, I get a black screen after diskemu starts any image, and the computer hangs.
If I use v2.1.4 on the same computer, everything works fine.
I tried replacing only the diskemu module in a v2.1.6 cd with the one from v2.1.4, but it did not solve the problem, so the bug seems to be not (only) in the diskemu module.
Just as a note, v2.1.5/v2.1.6 do work correctly on another computer I have.
If you need help in identifying the source of the problem, I am willing to test anything you ask me to, in order to find a solution (I do not want to stay behind with v2.1.4...)