To add more context.

I have:
1) removed my MT4 data folder and created new demo account
2) mapped UK100 to SPA35

Z1 started successfully.

Then I have commented out UK100 again. And after restart Zorro went into the same issue.

1) zero devide in Zorro.mq4 (349,61) in MT4
2) can't connect from Zorro after a timeout

So it's sort of persistently broken Zorro/MT4 connection.