Oh, and this only seems to happens with a big canvas (3500x2300 in this case). When I open artrage with 1920x1080 this does not happens. Weird.
seems like there's no fix for this right now, as it was reported earlier:
https://forums.artrage.com/showthrea...tifact-bug-(-)
maybe the upcoming artrage 5 will have this issue sorted out
*fingers crossed*