There is a bug in Joomla! 3.1.4 which causes some extensions to show a 500 Error. SchuWeb Gallery Pro, not the basic version, is one of those. If you get an 500 Error with Joomla 3.1.4 than you can install this patch http://docs.joomla.org/J3.1:Extensions_Broken_in_3.1.4
Else I would personally wait for the Joomla! 3.1.5 update.