The simple answer is the decoder is no good. Do you have another you can try in it's place.
Maybe contact Digitrax directly and ask them. This appears to be a Digitrax issue and not JMRI.
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Peter Ulvestad
JMRI Users Group Moderator ( )
Tam Valley Group Moderator ( )
Sprog-DCC Group Moderator ( )
Edmonton Model Railroad Association ( )