FWIW, it's happening to me too. I assumed it was happening for everyone but it sounds like that's not the case.

I decided to check for updates manually (from the Help menu) and there was one! (Sept 20th update). What's strange is that, like EuropaViewer experienced, recently (perhaps since Sept 20th?) DPX9 did an update check every time it started but always reported that the program was up to date - which it turns out it wasn't. Now, after updating manually, I not longer the get automatic check for updates at program start.

Seems like it was a bug that they've hopefully nixed in the current version. Perhaps try updating manually EuropaViewer and see if that helps you too. Good luck!