You want to be able to EDIT the site too? That costs extra-----just kidding, of course. The access problem seems to be very common and MS hasn't come up with a real solution in the years I've been using OL. The fix for me was to switch to Firefox and I've never had the problem since, so that's not what's causing your problem. Deleting your temp files/cache/cookies is routine maintenance and is worth a try. That's probably what support will tell you to do-when they don't really know a solution-no matter what the problem- they always suggest that. You can reach them via email from the link on the home page of this community on the right hand side (-the phone link takes you to the email form too I believe).
I've also seen others report that pasting either code or formatted text (for instance from Word) directly onto a page, can lock up the page editor. You could try creating a new page and OVERWRITING your default.aspx page to see if that helps.