I'm trying to set up aggregation and compression on my site, but am having problems. When I enable aggregation, either through core or through AdvAgg, it seems that aggregates are being generated for both CSS/JS files when I check sites/default/files, but only the JS aggregates are actually being loaded. When I check my page sources, the browser is displaying all of the original CSS files as though an aggregate had not been generated/enabled. I'm running Omega and a sub-theme, if that's a possible issue. Any suggestions on what to try?
EDIT: As per my comment below, the only theme option I see relating to aggregation is "Rebuild CSS and JS aggregates on every page load", and checking/unchecking it doesn't seem to have any effect. I can't seem to find anything else relating to aggregation within the theme settings.