Thank you for the debug information.
That confirms that Opus is calling Norton's shell extension (unless it has more than one context menu shell extension and this isn't the relevant one, which is possible but also quite rare).
Since Opus is calling the extension but it doesn't seem to be adding any menu items in response, I'd say it makes sense to pass this back to Norton so that they can debug what's happening inside the call.
That said, it's also worth a try to change Preferences / Miscellaneous / Advanced: dlldir_security to False in Opus, then fully exit Opus and try again. (If it doesn't work, please set it back to True and restart Opus another time. The default mode is more secure but does trip up a handful of shell extensions.)