I am sorry to hear that have had issues with the Intel graphics. I would like to escalate this matter to our engineering department and I will need additional information:
According to your information, you have driver version 3347, please bear in mind the latest video drivers available on the Intel web site for the Intel HD Graphics 4000 is version 3345. If this issue is still current when using our driver version, please send the graphics report generated within graphics properties and run DirectX to get the report as well.
Also, I was unable to see Dropbox information.
To get the latest video drivers go here:
Allan