DeZog/CSpect (v2.12.22):

• Watchpoints work unreliable. Under unknown circumstances a watchpoint (aka CSpect read-breakpoint) might prevent simple stepping. In that case do not enable watchpoints (do not use "-wpmem enable".
• Z80 unit tests do not work. Most probably because of the Watchpoints issue as, even if wpmem is not used, the unit tests use watchpoints internally.