I don't think it is the url that has the problem. The problem is the $ARG does not handle the comma in setmenu. I added a line to sub the | for the comma for a new variable to be used in setmenu.
} else {
$_PriorTabs_ENameA = gsub( ",", "|",$_PriorTabs_EName);
setmenu($PT__m2,macro,$_PriorTabs_EName,"_PriorTabs_OpenTab(".$_PriorTabs_ENameA.&
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