I don't know if the previous two posts are directed to me or the OP. If to me, I understand that the QNAP cannot be accessed while in Turbo mode, just as I understand why Turbo allegedly exists (I have a metered connection). I made the suggestion in case the OP had Turbo enabled for perhaps the same reason as I.

I have to turn Turbo off in order to connect to mine (just in case you have it on).

26.0.1656.60

Loading a pdf in Opera works as expected until you switch tabs. Going back to the pdf results in a frozen page that must be reloaded for functions to be restored.

@ho72 You can turn Turbo back on. Today's update should have fixed your printing issue

No, it did not. Version info: 26.0.1656.32 - Opera is up to date

That did it. Thanks.

Just create an outbound firewall rule to block autoupdate.exe (or whatever it's called). Disable the rule when you want Opera to update at a time of your choosing. Note that when the update is complete, you'll have to update the firewall rule as well because the update executable will now reside in a different folder.

As I pointed out in my thread that was closed,

https://forums.opera.com/topic/6777/save-as-pdf-issues/3

I'm using Opera 25. Will look for Opera 26.

EDIT: Opera 26 now installed, get this message: Opera does not include the PDF viewer which is required for print preview to function.

Found a PDF viewer extension but installing it made no difference.

You can work around this issue easily:
Opera does have "Save as PDF"-functionality built-in so you don't even need PDFCreator or alike:

Press Ctrl+P or choose "Print..." in OMenu to open print preview
click "Change..." in the destination field
Choose "Save as PDF"

Not happening here. Save as pdf is not an option under Print nor does it appear under Save As.

Lately when I save a webpage as a pdf using Cute PDF, the text in the pdf is not selectable, copyable, etc., because the document contains no fonts. This happens using Opera 25.xx, but I don't recall it happening with earlier versions (~23.xx). If I open and save a pdf of the same page in Opera 12.17, the pdf contains actual text with the fonts listed in the document properties, and thus said text can be selected and copied. I think this rules out any issues with Cute PDF.

Is there an Opera setting somewhere that I need to change to get my pdf fonts back?

Filed a bug report.