I have other problem with undo in Dreamweaver CC: it treats all actions in ALL opened files as a single undo list of actions. Kind of:
1. change in file A
2. change in file B
3. change in file B
4. change in file A
...
So if I do some changes in file A, then go to file B and do some changes there, then go back to the file A and press Ctrl+Z I expect to undo my earlier changes in this file A (as actually behaves ANY multi-document application on ANY system). Instead it throws me to the file B and starts undoing my actions in this file.