I have the language sett to Nor but nether the automatic or the normal spell check is working.
If you expect any sensible advice, please, report OS name, exact numeric LO version (see Help → About LO) and save format.
As far as I know, there are two variants of Norwegian: nynork and bokmâl. Which one is in effect?
Where do you set the language? Imported from the OS? Explicitly set in your document, but how do you do it (several possibilities, this is why I ask)?