@herid
Ahh I notice that now.. we have that cors error fixed and will be sent out in the next deploy of the software. It generally only effects latex here, this is the first time I heard of it effecting an external tool. I'd be kinda surprised if it is the cause but maybe.
@Tibor
@freemo thanks, he provided a screenshot (in the quoted tweet) which shows some debugging panel messages. Don't know how helpful that is. the developer is @Tibor