I have used Plogger before and have never had this problem with it. If you go to http://riverdays.org/index.php?option=com_wrapper&Itemid=7 it gives the error
Warning: Unknown: write failed: No space left on device (28) in Unknown on line 0
Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0
This seems like a DB error, but the fix would be something along the lines of changing the Store_Session path or something in a Plogger config file. Problem is, I've looked through the files and can't find anything similar to that.
The site I am working on is live and needs to be fixed asap or I am going to have to remove Plogger and find another gallery script.