I’m on an up-to-date debian testing distribution (i386).
selecting text, and choosing “bold”, does activate the bold status, but the text is not displayed bold. Same applies when exporting to PDF. Italic and underlined work ok.
selecting text, and choosing “bold” again (to unset boldness), does not change the bold button, and continues to display bold, instead of unbold. Text is still displayed unbold.
setting the cursor in the middle of text, which -according to the bold button- is indicated to be bold, is then not indicated to be bold
That’s pretty basic stuff.