I'm getting some strange behavior from Magento's caches, where it will serve the same cached header/blocks for all users...
ie. if John Doe is logged in and is the first to view a specific category page after a cache refresh, Welcome, John Doe is saved in the header and then displayed to all customers. Same goes for cart totals and even store specific product listings. This causes great confusion, as navigating around the site your cart total will keep changing.
The only thing I can do is disable block and full page caching, but this is slowing down my site.
What would be causing this kind of behavior from Magento's cache system?
