If DirectAdmin interface is corrupted, you can try the following fixes:
Reinstall skin.
# cd /usr/local/directadmin/data/skins/
# ./packskins.sh
Recompile PHP using the following commands.
# cd /usr/local/directadmin/custombuild
# ./build update
# ./build clean
# ./build php d
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Regards,
Vinod T K