insert special character crashes libreoffice write?

I click the omega icon button and it crashes libreoffice write which then gives me a dialogue to recover the document. Same happens selecting the ‘insert’ menu, ‘special character’ option. I need to access the special character tables as I use this stuff all the time.


hi - I have looked at the font list and many fonts titled by a header are missing i.e. the pictures of the characters. Have I somehow lost/deleted/change existing fonts without being aware of doing this? and could this have caused the problem - just an idea from a complete novice.