Photoshop :: CS6 - Data Set File Doesn't Refresh

There appears to be a bug in CS6 - does this work in any version of Photoshop?
 
Problem - data sets are not refreshed when contents of the data file are changed, despite clicking "Apply Data Set".
 
The latest updates are installed, running on Windows 7 Professional, 64-bit, plenty of RAM and available storage. This has never worked before and appears to be a bug in the software.  I’ve gone so far as to close PS and even rebooted between steps 4 and 5, same problem.  Here's how to recreate it:
 
1. Create a psd, define variables (I've tried both text and graphic layers)

2. Assign csv file as "Data Set", save the psd

3. Run export, close psd

4. Chage data in csv that was defined as Data Set, save and close csv file

5. Re-open same psd

6. Click "Apply Data Set" - nothing happens
 
Data is NOT refreshed regardless of whether Data Set 1 or  “All data sets” is selected.  The only thing that seems to work is to open the PSD and redefine the exact same file as the data set again, then batch export.  Because I'd be dealing with volumes of psd files that use volumes of Data Set files that change daily, this isn't feasible. 
 
Defining (or redefining the same file) cannot be recorded in batch mode, nor through the listener (tried previous version just to see).