Screen goes blank and red lines appear

Hello everyone, I don´t know what´s happening to my course, everytime I try to paste some text or edit strange things happen. The screen goes blank and Storyline shows this rare lines. 

I upgraded today to the last update and started this thing.  Thanks for any help. 

By the way, I use an HP Envy, Windows 8.1, latest flash, 16gb RAM and Intel iCore7. 

2 Replies