What i have done:

close Zorro and MT4.
deleted MT4* files in the %temp% folder
start MT4
=> now i have a mt4mapr.sys with the current date and time (i guess this is for real accounts?)

On that MT4 instance i have a demo and a real account!
i deleted the real account and deleted again the mt4mapr.sys file
restarting MT4 ...

Again it creates a mt4mapr.sys file with current date and time and Zorro shows the same error.
One minute later it creates also the mt4mapd.sys file ...
(getting tricky :-) )