I have restarted both DW and my computer to no avail. Any suggestions are appreciated.
Which version and build #?
Which operating system?
Does this happen with all files?
Does this happen with all sites?
When did this begin happening?
Please see below
Which version and build #? CS6 build 5861
Which operating system? Windows 7
Does this happen with all files? Yes
Does this happen with all sites? Yes
When did this begin happening? about 1 week ago
Have you tried deleting the cache file as of yet?
That's a good step to fix a lot of odd behaviors that crop up in DW.
Thank you Jon Fritz II - clearing the cache per the link you provided fixed the problem!