White Screen After Login
Check your firewall settings, maybe something is being blocked.
Also, without knowing anything about your system specs, people can only make wild speculations about possible reasons for this issue. If you are playing on a laptop, it obviously is slow to load and run the game (as the hardware can’t keep up).
Not my firewall, GW2 is unblocked.
My specs are
8 GB RAM
Windows 10 64 bit