Due to a bug discovered right after release The AWSOM Pixgallery Plugin has been updated to 4.4.1. The bug fix only affects people with custom permalinks, and only if they wanted to use the automatic cache folder. Otherwise there isn’t anything different for other users. If you want to upgrade to 4.4.1 simply overwrite your files with the newer versions in the new download, no need to deactivate and reactivate the plugin. If your cache still doesn’t appear add a / in front of the listed cache path in the cache field in the Pixgallery Options menu to make it look like: /wp-content/uploads/cache/
This will fix the issue.