Hello!
Perhaps this issue was resolved in later versions already... I still use Minitek Slider Pro, version 5.0.1. If image files have CAPITALIZED letters in their file extensions (like image01.JPG), the slider module will not show up at all.
As soon as I change the file extension to lower case letters, everything works as expected.
This is not the case when the same picture files (with UPPERCASE file extensions) are used in custom slides.
Thanks and regards!
Chris