Hi all
I have tried a couple of different pdf handlers Sumatra and adobe reader and they seem to display the same
some pdf;s display as text in the viewer pane
It's strange if it works in some places and not others. It should be the same viewer at the end of the day.
If you look at a file which works everywhere, do you see the same user interface when you right-click inside the viewer? If not, it's possible that Opus is using a different viewer to Explorer. You can configure that under Preferences / Viewer / Plugins, then configure the ActiveX+Preview+Office+Web plugin.