Hello there. We\'re sorry to hear about your problem. This could be related to an issue we\'re working to fix now. We will email you and see if we can get it worked out.
To answer your question. You can see how many \"licenses\" are used by looking at the number of \"objects\" in the bottom right-hand corner of the screen when you\'re in the Primary tab, though we\'re working to make this easier to see.
And yes, you can \"reuse\" licenses by simply deleting devices from the Primary tab, or by choosing \"New\" under the File menu to delete everything.