Multiple problems with WordPress 4

Hi all,

I installed wordpress 4 and now I have multiple problems. When editing or creating a post, the text is there but I cannot see it unless I highlight it. I also cannot add images , add categories or even click Screen Options on that page. Nothing happens when I try.
Also, activating jetpack seems to cause a white screen, I had to delete it using filezilla to get back to my dashboard.

Has anyone seen the same issues? I’ve tried different themes with the same result.

Regards,
Niall