I've been having the issue all day that I can't join any servers because an issue with my computer is blocking the VAC system. The web page (https://support.steampowered.com/kb_article.php?ref=2117-ILZV-2837) says that custom files can cause it, but I haven't downloaded any game-modifying stuff in ages (besides new jump maps, which really shouldn't be the problem). I really don't want to uninstall the game and lose my current settings. Does anyone have a potential solution? I've already verified my game files, didn't help.