Thank you for reaching out to the Constant Contact Community. It's my pleasure to assist you today. I've taken a look at your account and did not see any events so I wasn't able to recreate this. I did try sorting through your emails and was able to successfully do that, so I wanted to make sure I'm looking at the right account. If you're in a different account, could you please email us the username and reference this post to social_support(at)constantcontact(dot)com.
If it is just happening with your emails, I'd like you to try a few things so that we can narrow down the cause of this problem.
Try Incognito mode in Chrome:
If this works, then it means that you may have an add-on enabled somewhere that is causing Constant Contact to not be able to load fully.
If that doesn't work, please try another computer, if you have one available. If you're having this trouble on a work computer, perhaps try a personal computer that isn't attached to your work network, or vise-versa. This will help us determine if it's something happening with a specific computer or if it's possibly caused by security settings on the device or network.
Additionally, please let us know if this happens when you try to sort any other data such as files in your library or your contacts.
We look forward to hearing back from you! Thank you for choosing Constant Contact.