Photoshop :: Batch Combine Multiple Image Sequences

After assembling the render output of my 3d app in photoshop (32bit) and changing the appearance via several CC layers in different layer modes (e.g. Hue/saturation in Overlay mode) I ended up with my composing for print purposes. The comp is complex, with several masked folders, single masked CC layers and many image layers (some with masks). Now the client wanted me to animate part of the image. No problem I thought. But the trap is of how to assemble the different image sequences (diffuse, specular, reflection, masks, etc, etc). I came up with a PS action which loaded the single images and arranged them in the same fashion as the master file. But now PS doesn't load the incremental images for the batch processing. Images are named in a Diffuse_00001, Specular_00001, ... fashion. Loading the first set works, but from Diffuse_00002 everything goes wrong and PS load the 00001 files (except from one file which loads in the proper incremental way). I can't transfer this stuff to AE as it is much too complex and I do no AE only very little. I guess PS should be capable to solve this batch task, but a simple action via batch seems to fail.