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'm having this same problem. Tried both #12 & #4, neither worked. Only some of the missing buttons and missing interface items show up when I scroll over them.
Have you run the Mac Software Update? There were some interface problems with OS X 10.7.3.
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.
I have a ViewSonic 27" HD LCD display.
Thanks for your suggestion regarding the update, but I had already done that.