What are your system specs?
The first that comes to mind to try is force Borderless mode (or windowed) to see if it's any different.
It certainly sounds like a Display Driver issue though. System specs (dxdiag) will give us a better picture to draw conclusions from.
* Does it ever crash?
More Info:
Im getting the same problem. Please help
Problem signature:
Problem Event Name: APPCRASH
Application Name: GW2.Main_Win64_Retail.exe
Application Version: 1.0.1.0
Application Timestamp: 56ba8653
Fault Module Name: GW2.Main_Win64_Retail.exe
Fault Module Version: 1.0.1.0
Fault Module Timestamp: 56ba8653
Exception Code: c0000005
Exception Offset: 0000000003228a46
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033
Additional Information 1: 351a
Additional Information 2: 351aac274734aaad95c477acbb58b430
Additional Information 3: e56e
Additional Information 4: e56ebe0fc1421673df88dbed696173f5
