My new server has never been able to show the main HotSanic index page with thumbnails images, all I got was resized images. This problem had never happened on the old server.
I eventually gave up, then I really wanted to find out why I could not get these thumbnails, I had ImageMagick installed after all and the log files were not showing any errors, and no specific resources are available on the web about this problem.
After some investigating I found out the cause.
In the main HotSanic settings file, there is a CONVERTMETHOD variable.
The options available are explained above this variable.
My settings was CONVERTMETHOD=”HTML” all I had to do is change it to CONVERTMETHOD=”ImgMgck”
After that I ran the makeindex.pl and convert.pl and presto, my thumbnails were there.