BUG: moving tasks and displaced menu

Hi,

Great app but lately me and many of my partners at Inboundcycle (Pau's Valdes company) have been having some bugs. I made a video so you can see what's is going on. The menu appears always in the left of the screen and also I have trouble moving the tasks (I don't know if my colleagues have this one as well)

I attach the "what's my browser code" however I use windows but many of my coworkers are having the first problem in Chromebooks as well.

http://whatsmybrowser.org/b/37ZQO80

https://drive.google.com/file/d/0B86uHzr09Ba3YWo2cWNWdzFNbVE/view