Export Arnold Standins from Maya

I’m trying to get our farm to export Arnold ass files from Maya but for some
reason Muster won’t run the command.

Muster tries to run the following (This is just my dummy test scenario to get it working):
[MUSTER]Spawning process C:Program FilesAutodeskMaya2015binmayabatch.exe inside C:Program FilesAutodeskMaya2015bin using the following command line flags:

[MUSTER]-batch -file “W:tmpa.mb” -proj “W:tmp” -command “select -r pSphere1;arnoldExportAss -f “”W:/tmp/a.ass”” -s -asciiAss -mask 24 -lightLinks 0 -shadowLinks 0;”

but it just completes the job in a few seconds without doing anything.
The log doesn’t say anything as it completes the job almost instantly.
It doesn’t even log trying to open the file.
If I run the exact same command in a terminal it works perfectly.

Even if I just make it even simpler and just have the muster job run:
“C:Program FilesAutodeskMaya2015binmayabatch.exe” -file “W:tmpa.mb” -proj “W:tmp” -command “print 123456”

it starts the job but never executes the command.
Yet again it works in a terminal.

Is it something we’re missing in our template or have Autodesk just changed how
commands are sent with commandline.