I’ve found that “windowed fullscreen” mode acts differently with the 64-bit beta client vs. the standard 32-bit client. Both report “Gw2: 54,869” in the options window. I’m running Windows 10 Professional 64-bit with NVIDIA driver version 353.82 (GTX 970).
My monitor setup is as follows:
Monitor 1 has a 3840×2160 resolution.
Monitor 2 is in portrait mode and has a 1080×1920 resolution.
Monitor 2 is arranged to the right of monitor 1. Logically (i.e. in the display settings), the upper right corner or monitor 1 aligns with the upper left corner of monitor 2.
Using the 32-bit client in windowed full-screen mode, the game window fills monitor 1 and does not appear on monitor 2. This is the behavior I prefer.
Using the 64-bit client, the game client window is 4920×2160, as if trying to fill the union of both displays. (See the attached screen-shot). As displayed on screen, the lower-right corner of the options dialog is positioned at the lower-right corner of monitor 1. Further, it doesn’t span both monitors correctly as both the right and bottom edge of the character select screen are off the edge of the monitors in the attached screenshot.
