Running the latest versions of the Plugin and WordPress with PHP 5.3.
When running the plugin, I get the gravatar images being posted in the plugins/fv-gravatar-cache/images folder however they are all 0 byte.
Putting the plugin into debug mode, here is the data in the file:
Processing 25 gravatars INSERT, http://www.groovypost.com/wp-content/plugins/fv-gravatar-cache/images/f1968f0296e86da785ec6a197ea86625, 96, email@example.com, Wed, 08 May 13 02:49:58 +0000 Error: '' INSERT, http://www.groovypost.com/wp-content/plugins/fv-gravatar-cache/images/920382e337db25b22eff610ceb22e3fe, 96, firstname.lastname@example.org, Wed, 08 May 13 02:50:08 +0000 Error: ''
Looking on the site, I cleared cache however nothing is getting cached. I assume that's the Error in the log.txt file.
Looking at permissions on the images folder, it's set to 0755 all the way up to the root.