test use blender 2.57b win32 (official blender.org)
open my file .... (attach here)
on compositing mode :
-- image node input didn't read image files ( render010001.png ) as sequence image,
-- image node input read image files ( render0001.png ) as sequence image,
Description
Event Timeline
In path_util.c the function BLI_stringenc makes the string that picks out the correct image to choose. The problem is that is assumes that all image sequences start being numbered at 1. Your image sequence starts numbering at 10000. If you placed any non-numeric character between the first part of the number 01 and the rest 0001, even an underscore like, render01_0001, the image sequence would be correctly picked up.
That's a short term fix for you, and why it's broken.
The long term fix would mean changing the way the BLI_stringdec & BLI_stringenc functions work so that they could find a sequence of number that doesn't start at 1.
Possible fix submitted as patch
http://projects.blender.org/tracker/index.php?func=detail&aid=27240&group_id=9&atid=127
This isn't a bug, the offset needs to be set to 10000 so file render010001.png is used as the first frame.
Realize this is not at all clear, we need better tooltips/docs.