Take care which library use each viewer. PDF generated from Therion use group transparency knockout. Check wiki: https://therion.speleo.sk/wiki/contrib:externalviewers 

I don’t know Okular, but only correct viewer is Acrobat.

Martin S. 

22. 2. 2022 v 19:29, Rodrigo Severo via Therion <therion@speleo.sk>:

Yes, I am using Okular. Tried Firefox and FoxIt and they were instantanious.

Thanks for the tip Bill.


Rodrigo
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