I had a similar problem when trying to use my mouse after adding a tablet to my computer. Went to File->Input Devices and noticed my mouse was set to disabled. Changed it to screen, and everything seems to work fine now.
I had a similar problem when trying to use my mouse after adding a tablet to my computer. Went to File->Input Devices and noticed my mouse was set to disabled. Changed it to screen, and everything seems to work fine now.