The icons in the Library under each thumbnail indicate whether or not the design is synced with the server. Synced content will be accessible on multiple devices as you sign into your account in the Library.
The lock icon indicates content obtained from the Silhouette Design Store, including free designs included with Silhouette machines or promotional content from Club Silhouette memberships or product bundles and Starter Kits. This content is always synced and cannot be adjusted.
The "X" icon indicates a user-created design (i.e. non-Silhouette design you have created yourself or otherwise saved into the library) that is not synced to be shared with other computers or devices where you might also access your library. You can toggle the synced status on and off by clicking on this icon.
The check icon indicates a user-created design that is synced and will appear on other computers or devices where you might also access your library. You can toggle the synced status on and off by clicking on this icon.
The star icon indicates the favoriate status. If the star is blue, then it will appear automatically in the "Favorites" folder for easier reference. You can toggle favorites on and off by clicking on this icon.
The triangle with an exclamation point icon indicates an error. You can hover over the icon to display the error code. Errors are listed in the sections below.