A bug in 1.5.2 (and possibly other versions) was pointed out to me by a customer today regarding the WYSIWYG editor in Magento wherein subfolders you create are later not displayed when you open up the image chooser again

There's a small / frustrating Bug in Magento 1.5.0.1 where dates in the months July to September prior to 1970 are no validated correctly and so the order cannot proceed.