cPanel WebDav not working for a single cPanel account:
tail /usr/local/cpanel/logs/cpdavd_error_log
PROPFIND: / -> 400 ‘Bad Request’ {Can’t locate Cpanel/Carp.pm in @INC (you may need to install the Cpanel::Carp module) (@INC contains:) at /usr/local/cpanel/Cpanel/Logger.pm line 514. }
To fix this problem, navigate to .cpanel directory and remove the webdav_locks.bin.lock file