The fix takes about five minutes (or less) and involves digging into one of iSync's resources, cutting and pasting some text, and dragging and dropping a single graphic file. If you can cook from a recipe you can complete this hack, whether or not you think yourself "tech savvy." And it works - or at least it did on my MacBook with the aforementioned 5300! I just synched my contacts and calendar information over Bluetooth.
Mac users, check it out: tumblr.matschaffer.com/post/167518