If I'm logged into the site as an administrator, everything works fine. No errors, no nothing. Works brilliantly.
Once I'm logged out or any other visitor tries to visit the site, this is what they get:
Warning: unserialize() expects parameter 1 to be string, object given in /home/content/p3pnexwpnas02_data02/91/2543291/html/wp-content/plugins/gantry/core/utilities/cache/cache.class.php on line 138
This site has been up and running for a few years, but only within the last year or so has it really begun to give me some headaches. This only seems to be happening after the latest update, but not sure which update did it, honestly. It's not the first time and clearing the site cache has worked in the past but not now.