Rotrics Studio issues (mac version)

Trying to draw something for the first time:
Works fine up to here: Connect, home, z-, set work height, select object or svg
Problem 1: Object (for example sample cat) looks very fuzzy (unlike tutorial), hardly distinguishable what it is
Problem 2: Clicking Generate G-code brings message “previewing”, never a success message. Clicking on Start Send brings message “Generate G-code first”
Problem 3: Rotrics Studio uses massive CPU resources constantly, also when doing nothing (I have a 2019 macbook pro - performance of youtube tutorial, for example, is impacted when Rotrics studio is running)
So far I am unable to do anything useful, as cannot generate G-code. Thanks for any tips.

This is preview stuck bug, we are solving this problem. Thanks for your feedback.