[Hummingbird Pro] Browser caching not working properly

Browser caching not working properly. I have tried many of the troubleshooting steps for getting browser caching to work with no luck (reboot, reinstall, disabled other plugins). It is set to active an automatic but not working. I tried to do put the generated code snippet in the .htaccess file but it warned me that it was already there so I did not add. I had w3 caching before but reverted it to default settings and uninstalled. I have read online that I can set the mod_expires caching manually in .htaccess but that would defeat the purpose of using the plugin. Is this as simple as adding a mod_expires=1 ? is this something that has been seen before when moving from w3 total cache? Thanks!