Images are not renamed during mass loading

Hi

First of all thank you for great plugin. It is working just fine!
Still one minor bug I can’t resolve for a while

When I imort csv file with records on Field Mapping page section Images I check checkbox
Files “Change image file names to” and put inside field {secid[1]} where secid is column name of my csv file where new file names stored ( one per record as I have only one pictre per record). But unfortunately files are not renamed after import.

The same problem arrises with file extensions.

Thank you in advance for your time.

The page I need help with: [log in to see the link]