Thank you both very much for helping out. Much appreciated.
This is what I wrote before trying the spell check on it. Then it failed me again. I'm using Operabrowser which got an upgrade yesterday evening, so maybe the problem is situated there?
After writing this second paragraph, I tried the spell check again on the whole lot and now it did its job perfectly. Problem solved and case closed, I guess. Many thanks, again!
Feel a bit silly nonetheless.