Link Problems

Hi all;

I am having problems putting links in my posts. When I try to add a link the scroll bar disappears on the side and I can’t move up or down and the link is not added. I have to leave the post screen and then come back in. I have been trying to add links from different browsers firefox, chrome and explorer they all do the same. I have tried from different computers too.

Any help would be great

Thanks,

Greg