Hi there,
Please rename the preferences folder for captivate, Location for Captivate Preferences folder:
Windows 7: C:\Users\[user name]\AppData (hidden folder)\Local\Adobe\Adobe Captivate 6 folder
Windows XP: C:\Documents and Settings\[user name]\Local Settings\Application Data\Adobe\Adobe Captivate 6 folder
Mac: /Users/[user name]/Library/Preferences/Adobe Captivate 6 folder
Rename Captivate 6 to OLDCaptivate 6
Now run Captivate as administrator. (Right click on Captivate and run as admin) and then export, edit and import the captions.
Thanks.