To find out if it is due to the modification, you may try uploading a virgin/unmodified classipress (with a different folder name) temporarily to see if the thumbnails will work.
To find out if it is due to the modification, you may try uploading a virgin/unmodified classipress (with a different folder name) temporarily to see if the thumbnails will work.
It is not a default option and yes it may require some custom coding to implement.
