Likely related (if not a duplicate of) bug #170356.
The current development version (0.92+devel) allows exporting to PNG without anti-aliasing (which might or might not be acceptable for your application). You could check if this solves the issue you're describing.
Likely related (if not a duplicate of) bug #170356.
The current development version (0.92+devel) allows exporting to PNG without anti-aliasing (which might or might not be acceptable for your application). You could check if this solves the issue you're describing.