Hi Matevž,
I think I found a suitable environment for Mach3 R3.043.066 and Pokeys57E plugin v3.1.42. below was an experiment that I did.
I went to my desktop computer, installed all needed software and tried them. After several testing, there's NO symptom of bad motion. I noticed that PC has only single network card.
I came back to my previous two notebooks and disabled wireless network then tried them. Surprisingly, I found a solution. (at least for the time being)
At this point, I think that the sub-network of wireless is different than other two devices and causes the problem. Or there are some of other things which I don't know and I hope that you guys can find out and solve it permanently.
I connect Pokesy57E directly to Ethernet port with single cable, not through switching hub.
Yes, mostly I do the dry run, I have 2 LED attached to show step/direction signals, there is no interference issue.
thank you,
Weerasak