Yeah it's pretty easier to monitor. We have access to a control panel to check on people and their ip's to make sure they don't abuse multiple accounts if they are free users and monitor server usage. If they go above a certain threshold we can cause a client to crash by sending a fake NPE to the script.
if you have a high resolution that is the reason, for this java applet it doesn't scale well with resolutions above 1920x1080
as for your mirror mode issues, make sure you are using the official client loaded alongside osbot.