Hi Yutaka!
I did what you said: I uninstalled the language plug-in, a dictionary is selected, I manually configured (is that the problem?) the Pop-up Context menu to include “Spelling suggestions”, I am clicking the RMB over an erroneous word, but nevertheless the context menu shows a PARENTHESIZED GRAYED-OUT “(No Spelling Suggestions)”.
Well, where did I go wrong?
Regards
Meir