Calibre Font option keyboard shortcuts

When updating the metadata for a book, I remember being able select text and then hit ctrl-B to bold, ctrl-I for italic and ctrl-U to underline when editing text in the Comments box. I just tried to bold some text and none of the keyboard shortcuts worked. Right-clicking the highlighted text and selecting Bold (Italic, Underline) from the Fonts menu does work.

I haven't used those keyboard shortcuts to modify text in the Comments box in quite a while so not sure when it stopped working for me. Is this an problem with my setup or are other people noticing the same issue? Possibly an issue with the widget used to edit text in the comments box?