Thanks to the Guardian's technical help people, I have the July genius crossword!
And I got the first clue I looked at straight away - but then I looooove cephalopods. Sadly a lot of the other clues are slowing me down but I'll have another go later.
There were two things I needed to do:
1. Install the latest Java properly and uninstall all the previous versions.
2. NOT try to sign in from the genius 'sign in' link because apparently it doesn't work. I signed in from the Guardian's home page and that worked.
Hope this helps anyone else having difficulty. If not, try the help people because they reply very quickly.