Originally Posted by ext233
i think the problem was a corrupt .mobi that i had converted, which was 'infecting' the books near it and causing them not to display correctly. i isolated the offending book, re-converted it and everything's working now. ^^
Glad you figured it out. Usually Kindles are very good for beeing predictably consistant. They assume and expect sometimes a bit too much that what you feed them is correct. Amazon optimized the Kindles to work for THEIR store, thus YOU are on your own if you feed in non-amazon conforming side loaded files.
You can't really blame them, they do a very good job. If a hardware-only company was to sell a device exactly like the Kindle with same features and all, then you would have to pay a lot more money. Kindles don't cost a lot, but they are not "cheap" in a sense as cheap and crap. They are worth a lot more than their sticker price.