According to the official support website, you shouldn't encounter any difficulties regarding this matter as long as you have a stable Internet connection. To try to fix this, it's advised to clear the cache of your Internet browser. This can be done differently regarding the program that you use. For Internet Explorer, you can do this by opening the application, press the Option button that looks like a gear, go to Internet options, and click Delete. Select all the fields and press OK. If you are using other browser software, you can use Google to find a way to delete the cache.
If you still experience problems, it's advised to contact the developer on the official website.