cursor frozen on pencil

Hi, I'm starting a new document, and for some reason every time I go to a different window other than inDesign, when I return to the InDesign window, my cursor has changed to the pencil symbol, with a circle with a slash through the middle. I can't edit or change anything in the document, or change the cursor back. Every time I restart, I get the regular pointer and edit options back, but the second I click on anything or switch windows, it goes back to the error pencil. I've restarted my computer three times, nothing is changing. This hasn't happened before, and I had been using the program all morning without issue. Please tell me what is happening and how I can fix this, I'm in a class and can't follow along with the instructor.