Unable to check 'Check grammar' checkbox

[wetyourself]

When I select 'Spelling and Grammar' from the 'Tools' menu I get a dialog as is shown in the screenshot below.

The problem I have is that I'm unable to check the 'Check grammar' checkbox in the 'Spelling' dialog box under the "'LibreOffice 5.0' - 'The spellcheck is complete'" dialog because the smaller, front one has focus, preventing me from interacting with the one below it.

As soon as I click 'OK', both disappear at the same time.

I also notice that the 'Text language' drop-down menu isn't populated with a default value, & I wonder if that's another problem- a moot point being that I can't access the back dialog through the front one.

I looked through the available entries in 'Tools' > 'Options', & see no way to set that which I'm unable to in the 'Spelling' dialog.

Could someone give me a hand here?

[esperantisto]

Are you sure that your text language has a spellcheck/grammar check module installed?

[wetyourself]

Are you sure that your text language has a spellcheck/grammar check module installed?

No, I'm not sure. How would I go about checking that on my system? It's not Windows, so there's no 'Modify' option in an .msi or anything like that. I'm on Sabayon linux 15. I have the base + OoExtras installed via the Rigo package manager.

[esperantisto]

If you are not sure, check it and follow other steps described in [Troubleshooting] Spell check in OpenOffice.

[RoryOF]

In a document that doesn't spellcheck, look at the middle of the OO Status Bar. It should tell the name of the language OO thinks is being used. That same language should be selected in /Tools /Options /Language Settings /Languages as the default language for documents and should have a little blue ABC tick beside it. If there is no ABC tick either the language module is not installed for hat language or it doesn't have a dictionary for spellchecking.

Note that varieties of languages used in documents need to have the correct variety selected in that setting (spellchecking will not work across language varieties). (I'm using "variety" as dialect might have emotional overtones).