clear both AO’s cache and any page cache you (or your host) might have and things should be OK Alex.
hope this helps,
frank
Thanks for for your response Frank.
I have one last question. Disabling plugin does not remove the directory where AO stores the Cached optimized files?
Will my site still be Optimized by the plugin?
the directory is (or should be) removed when the plugin is deleted, but if the plugin is not active, then it is not optimized (unless when a over-zealous pagecache is serving cached HTML with references to static autoptimized CSS/ JS files in it, but typically disabling a plugin should purge all page caches).