Okay, so i'm just registered here and everything, but here is some information for all of you, and a process to fixing Dreamweavers Buggy Information Loss, EVEN if you have installed the 8.0.2 patch, you should follow these steps.
1. Download The Patch Via -
Updaters
2. RESTART YOUR COMPUTER!
3. After Reboot has finished
DO NOT START DREAMWEAVER
4. Start the patch up, If it asks you for the CD go to the adobe site, and download the DREAMWEAVER trial.
Trial Download
5. After product Update is finished, Run dreamweaver it will give you the same error as before, this time, edit your settings and put the username/password in, and then after it has saved, and successfully connected to the server, Close dreamweaver down, and [as a suggestion] reboot, the reboot isn't necissary but it can help the system a bit, then after you have completed that, Start Typing away in Dreamweaver again.
This method has worked on My Dreamweaver (which was in fact, 8.0.2 already) and on my Friends Dreamweaver as well, Me and him both use DW8.
As far as people saying its relivent to IE7 Yes/No IE7 does something weird to the Registry Keys and Saved Functionality of the My Documents folder... After i installed IE7 i noticed that my folders kept being reset. but my friends PC doesn't have IE7 on it, and it had the same problem, This method works for both Errors.