I know this has been reported before. And marked as fixed. So this is an ongoing problem.
What happened is that after log in the mouse is in cursor mode instead of movement mode. And more importantly: The toggle Mose cursor «.» does not work. which makes it impossible to move around.
Ending the game and restarting has helped. But this is a real pain considering the incredibly long login time (42sec to login, 53 to character select, 2:41 to load character — 4:17 in total) and you might have to start more then once.
And it is a simple function which should “just work”.