Pop-ups must be allowed in your web browser for SKULabs to work properly. SKULabs uses pop-ups to display documents for local printing, among other cases. By default, many modern web browsers block pop-ups from automatically showing up on your screen.
Here's how to turn that feature off just for SKULabs:
When Chrome blocks a pop-up, an indicator will appear on the right edge of the address bar:
To access that pop-up, and to allow future pop-ups from SKULabs, click the indicator icon. Change the rule to
Always allow pop-ups from https://app.skulabs.com and select
When Firefox blocks a pop-up, an indicator will appear above the site and below the toolbar:
To access that pop-up, and to allow future pop-ups from SKULabs, click the indicator icon, then select
Allow pop-ups from https://app.skulabs.com .
Unlike some other browsers, Safari doesn't always indicate when it blocks a pop-up. In order to use SKULabs effectively, you will need to completely disable Safari's pop-up blocking for the SKULabs website. To do so, open the Safari menubar menu and select Settings for This Website:
One of the options shown discusses the different ways that Safari can handle pop-up windows. Change that to Allow so that pop-ups show up without prompting first: