i have been having the same problem. I want to use -pb_rad charmm and -pb_rad roux, . But the given patch does not work . could you please help me with this. Thank you. Also what does "I just had to remove the last eval from your answer " means ? what is the replacement that actually works.

set ar_args [list assign_radii $currmol $pb_rad]
if { $pb_rad eq "charmm" } {
    # foreach p $parfile { lappend ar_args $p }
    eval [linsert $parfile 0 lappend ar_args] ;# Avoid a loop
} elseif { $pb_rad eq "parm7" } {
    lappend ar_args $topfile
}
eval $ar_args