If you are unable to use Swiftpage's Online Editor the first thing to check for is a Skype browser plug-in. If you do have a Skype plug-in on your browser you will have to permanently remove it to use Swiftpage.
This does not mean that you can no longer use Skype, just that the Skype plug in must be disabled while you use Swiftpage.
If this does not solve the problem, please contact Swiftpage support at 877-228-8377, x3 (+1-303-978-1000, x3 internationally) or support@swiftpage.com.