Hey Egon, I forgot to report something about the enviroment map on the second layer. On many machines the enviroment map is not being applied, I thought it was due a bad quality video card such as the s3 on mainboards like biostar or asrock, but I tested more and on a intel 128MB and on a Nvidia 256 MB the reflection efect didnt appeared!
No idea. It's simple multi-texturing, but it won't work if only one texture stage is available, which shouldn't be the case on a 256MB card. Can you post the driver/renderer initialization output that jPCT produces?