It would be interesting to know what decoder file you've updated/changed.
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Sometimes, updates to decoder files require changes to the JMRI code as well (Which is why adding newer definitions to older versions of JMRI is not usually recommended).
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If your updated file is based on one that received such updates between 4.26 and 5.10, your definition that's based on the older code may not work with the newer code.
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Steve
"Breezlys"
