Text Paste not working

Hi everyone,

I'm having a problem on text pasteing (both crtl+v and right click paste, both not working) recently with x6, for both artistic text and paragraph.

Image paste is working perfectly, but not sure what with the text. It started not working couple of days ago.
I've tried to paste the same text on browser and word document, they word perfectly. So probably not an issue from the window.

Probably I've mis-clicked some shortcut key to disable the function?

Thanks for answering.

Hayes