The first paragraph may need to be expanded
However The installation instructions correctly show the needed directories and permissions.
photopost
images (chmod 755)
uploads (chmod 777)
help (chmod 755)
data (chmod 777)
1 (chmod 777 - including subdirectories)
2 (chmod 777 - including subdirectories)
500 (chmod 777 - including subdirectories)
languages (chmod 755) (a
stylesheets (chmod 777)
templates (chmod 777)
forums (chmod 755)