Hi George, Thank you for the fast response!
1) I switched themes to 2014, I disabled all plugins except Events Calendar and found that the problem was resolved. I enabled plugins one at a time until the problem returned. I completed the process with all of the remaining plugins to ensure there were not multiple conflicts. It appears to only be an interaction with PixGridder Pro
2) I am running the current version of both plugins. PixGridder Pro version 3.2.5, Events Calendar version 3.9.1.
3) I have enabled WP_DEBUG and will report any PHP errors that show up.
Thank you!!