We can´t read minds.
-How did you start ESR (auto, or manually --> If manually, your disc is in the drive before you start ESR, I assume.)?
-Which variant of ESR did you use exactly?
-Which type of DVD+/-R/RW?
-Which type of DVD-Writer, Firmware, Burning-Application, etc.??
@IJTF_Cinder: He didn´t mentioned using ule, but that "ESR" is mapped to "ESR.ELF" (~in my meaning~ "ESR is mapped correctly in the ESR-Path-Option.").
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