Hi, after a clean installation of last version of limesurvey, i've tried to login to admin or view the frontend.
Initially, i've a strange 504 error on page.
After activation of debug mode 2, i've got the correct error/exception:

Could not find a working installed template

i the ftp folder, i see 3 template folder (vanilla, bootswatch and fruitiy) in theme/survey, and 9 theme in theme admin. On database table setting_global, the defaulttemplate = default and defaulttheme = vanilla.

i've tried to set all file as 755 in CHMOD via FTP.
Any suggestion?