Many games wont start in gamemode

Hi,
I have a problem with Chimera: many games won't start at all, such as Dirt Showdown, Assassin's Creed, Assassin's Creed 2, and Brotherhood. They all give a similar error:

ERROR: ld.so: object '/home/gamer/.local/share/Steam/ubuntu12_64/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS64): ignored.
ERROR: ld.so: object '/home/gamer/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/gamer/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/gamer/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
fsync: up and running.
ATTENTION: default value of option vk_xwayland_wait_ready overridden by environment.
ATTENTION: default value of option vk_xwayland_wait_ready overridden by environment.
ATTENTION: default value of option vk_xwayland_wait_ready overridden by environment.
ATTENTION: default value of option vk_xwayland_wait_ready overridden by environment.
ATTENTION: default value of option vk_xwayland_wait_ready overridden by environment.
ATTENTION: default value of option vk_xwayland_wait_ready overridden by environment.
Setting breakpad minidump AppID = 201700
Steam_SetMinidumpSteamID: Caching Steam ID: 76561198141429982 [API loaded no]
pid 17979 != 17978, skipping destruction (fork without exec?)

Some games, like GTA Vice City and CS2, start without issues. It's weird because everything was working fine a week ago. However, I had a problem with connecting to my TV, so I decided to reinstall the system, and now nothing works.

Could you please help me troubleshoot this issue?

Thank you.