Since I installed version 6.1.4.2 (on Windows 10 64bits), the spell checker no longer works. I have Dutch, English, French, German and Romanian spelling dictionaries installed, visible in the Extension Manager, and I can select any of these languages for all text, but when I want to spell check, the only available language is None. All languages appear in the dropdown, but after selecting one, only None is visible. If I try to launch a spell chek, I instantly get the message “the spell check is complete”, however long the text is.
Try resetting the user profile and fresh installing the spellcheck extensions.