Spell-check only works on a few documents

[Craig1]

Hello,
I’m having on-going trouble with both of Libreoffice’s spell-check functions.

I’ve tried updating LO several times over the past few months, but that changed nothing.
The spell-check always appears to function, and informs me that it has checked and there are no errors, even when I add random keystrokes. To make this problem really confusing, it actually works fine on maybe 15% of the documents I’ve used in the past few months. But there is no discernable pattern, whether I look at what file type the doc is, or who created the document!

Any ideas, apart from updating?

[ROSt53]

Please provide information on: — your OS and LIbO version — Which module of LibO you are using (Writer, Impress, Calc, Draw, Base)? — Which language and language settings are you using?