I was having a few problems with dreamweaver today. I could paste into the code view, and the following error was coming up when I tried to save using dreamweaver.
I found the following solution fixed the problem:
#4. Delete FileCache.dat files from the Dreamweaver user configuration folder.
Note: The language folder below is an abbreviation of the language you are currently using. Typically there will only be one folder in this location.
\Documents and Settings\[username]\Application Data\Adobe\Dreamweaver CS4 [or CS5]\[language]\Configuration
\Users\[username]\AppData\Roaming\Adobe\Dreamweaver CS4 [or CS5]\[language]\Configuration
Macintosh OS X
/Users/[username]/Library/Application Support/Adobe/Dreamweaver CS4 [or CS5]/[language]/Configuration