Dear jdani,
I also find this change since few version.
In fact, i think that Allplan add some new information for each line during the PDF export.
So when you read the PDF, the line looks thick but if you zoom in you can see correctly.
There is some option Inside the preference option of your pdf reader where you set to don't take car of thicker line, than you will allways see all lines normaly.
Bye & Good Use!
Mr Judy GURAVADU
Responsable Technique Préfabrication & Ingénierie
Precast Sales & Support
Allplan France & Allplan Software Engineering
Depuis 2006