Export to PDF

I’m currently using scapple for the 30 day trial. I have created a mind map with various fill colours in the notes. When I export to PDF only two of the notes have any colour and the rest are empty. When I export to PNG all the colours are there.
I love the software and would appreciate any help with this issue.
Thanks in advance.

I have a mac running 10.10.5
The version of Scapple I downloaded is 1.3.4