Since I have deleted those plugins, and don’t intend to install them again, what would be the best for me?
Right now, I’ve reverted to WP Super Cache and Better WordPress Minify.
that shouldn’t be happening since the tab sidebar is not js dependable.
try remove all widget in wp-admin->appeareance->widgets->tabbed sidebar
and clear cache and re-enter the item in widgets->tabbed sidebar again.
also make sure wp-admin->widgets->right sidebar-> had the ‘tabbed sidebar’ item.
my best guess would be plugin conflict, its working before right?
any new plugin activated since?
i think there’s one user also mention some issue with ‘Better WordPress Minify’ or similiar minifiy plugin issue but he resolved it. not quite sure how? he clear the minify cache or put some condition on caching.