I know this isn't your error but it's the best place to point you:
Go with #12, then #4. That should solve your issue.
I am having the same problems as listed above, and all my software is up-to-date.
My Hardware/Software specs are as follows:
Processor: 2.8 GHz Quad-Core Intel Xeon
Memory: 2 GB 800 MHz DDR2 FB-DIMM
Graphics: ATI Radeon HD 2600 XT 256 MB
Software: OS X 10.8.2 (12C60)
Dreamweaver CS6 v 12.0
I tried switching my web browser to Firefox, as Safari was causing problems with dialoge boxes in Photoshop CS6, but that didn't solve the problem with Dreamweaver.
Do you have a HiDPI display? Get the latest updates which address several bugs.