Won't apply PDB to ETL

[clackmannan]

I have a ETL file of a kernel driver trace. I have the PDB file for the driver. MS Message Analyser can apply the PDB to the ETL and show me the correct output

ETViewer can load the PDB and ETL files, but I can't get it to apply the PDB to the ETL, it's not decoding the ETL file correctly. So what am I doing wrong? Or is this a bug somewhere?