Yeah, not working.
When you open Instagram, it creates a file called "profig.os". Apparently it uses it do recognize the device, and could be used to log in somehow. :/
Edit: I managed to get in. What I did was uninstall ig, and then that file. I''ve had the file since October 2012, I should have backed it up first just in case I needed it tbh. Dumpster didn't put it in the recycle bin. After that, I did a clean install and managed to get in first time. What I'm scared of now is not being able to get in again. I have two accounts: My personal, and one for a business I'm trying to get running. It's really frustrating to only be able to access that one via bluestacks. It would be a very tedious thing to do if I had to delete this file every single time I want to switch accounts.
Edit #2: Screw it, I logged out... It works!