Hello
I do have the same problem with Version 2.73.1+171220.
Everything works if I set disabled to false in the kcfinder config file but
I do not wnat to allow everyone to upload files to my server .
I precise I have no .htacess file and the permissions of my upload/surveys directory are OK
drwxrwxr-x. 17 apache apache 4096 May 7 16:40 surveys
Is there another solution ?