Main question is, does it have loading in the center or is it without? I think like 20 out of my posts are the repetition of that one console command, either way here goes again.
On the character select screen, try opening up the console by hitting the : key , then type in
gl meshmode d
The usual alternatives are, try a free VPN to see if it's ISP related, or try deleting all salem files in c:\users\YOURUSERNAME\salem and c:\users\STILLYOURUSERNAME\.salem , the latter is hidden and contains some of the cached resources that might have been corrupted.
Third option is update or revert graphics drivers if those have changed recently, as well as potentially revert java version if that has been updated recently.