When DW encounters code errors it cannot reconcile, it something does funny things like you describe.
Check your code for errors (Window > Results > Validation. Click the Triangle > Check current document).
Fix reported errors and save.
I did that but the window was empty. I guess I have to do it when the problem occurs.
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- Just wanted to check are you still encountering this problem?
- Is it happening with some particular file? If Yes, Can you share your test files with us?
- Which platform you are using?
It only happened one more time and then the program locked up so I did a Force Quit. I'm using Yosemite 10.10.5
Please let us know if you encounter that problem again.