If you use Safari as your web browser, you could experience an issue if you try to open the scaling tool when you are trying to scale your blueprint. You will be able to upload a blueprint without problem, but when you open the scaling tool, you will only see an empty white page. This will happen if the Adobe Flash Player has not been enabled for safari.
You can find the steps to enable Flash for Safari on this page:
We hope that helps - please reach out to us if you still have problems.