[HELP] Stud.io - problem with strange "shadows" when exporting instructions

[barneius]

Hello there.

I've switched to Stud.io recently and have a big problem when exporting instructions (regardless the format: pdf or png).
I get those strange "shadows" of the bricks and have no idea how to get rid of it. Anyone could help?

problem by barneius, on Flickr

[GuyJones]

I have also been having this issue. Not sure if this is a factor but I'm using a mac. I've tried everything to fix it but nothing has worked.