Check the permissions on your wp-content/ and wp-content/plugins/ directories, perhaps?
What should the permissions be?
I believe it should be 755.
Both need to be readable and executable by whatever userid your web server runs as; or readable and executable to everyone.
ls -lh from within your WordPress directory. Look for the line for wp-content:
drwxr-xr-x 3 skippy skippy 4.0k May 26 10:38 wp-content
ls -lh wp-content
drwxr-xr-x 2 skippy skippy 4.0k May 26 10:38 plugins
To make it readable and executable to everyone, try this:
chmod -R o+rx-w wp-content
755 is correct, if your familiar with changing privileges that way. Skippy’s command should work just fine for you too.
