Exactly the same problem now myself.
WebAssist stuff is just so random, and infuriating, at times - it doubles the workload, because you have to re-do everything for no apparent reason, and you're left unsure of if it might do it again. You can't make backups of working pages because even those pages can just stop working.
Oh and this is nothing to do with Dreamweaver "weights" - this is purely a WebAssist issue.
It's so frustrating - I'm having to re-build my entire UE behaviour now because of this random sh1t. :(