Hi,
In my experience (and from what I have read), Coinbase is reputable. They definitely have their share of issues but they seem to resolve them eventually.
I suggest searching the Bitcoin subreddit for similar experiences. I think you will see that most problems are corrected (read the top comments for solutions, most of the headlines are overblown).
http://www.reddit.com/r/Bitcoin/search?q=coinbaseIn addition, it may be worthwhile to try accessing your account with a different browser to see if that changes how the site is displayed.
Good luck.