Sorry to hear you are having problems with this.
Is Drawboard PDF the default program for that PDF, that you are trying to open?
Also when you say you cannot create a new PDF, what is your workflow? Please write to us at email@example.com and we can look to help you out.
Drawboard Product SpecialistErik Staley commented
Windows installed some updates today. The problem I'd described below occurred after installation of updates. After rolling back the updates, the problem remains, however.Erik Staley commented
This happened to me starting today:
1) Click on any PDF file in Windows Explorer
2) Drawboard opens, but does not show that file. Instead, all previously opened files
I'd never had the problem before. I've been using Drawboard for about a year now.