unable to close instrument window, return to workspace

[water]

Hi, I receive an error when trying to 'conclude' or 'abort' in the instrument window. So I am unable to return to the workspace window

I'm running SoundLoom 17.0.4E, just installed CDP8

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can't read "dupl_mix": no such variable
can't read "dupl_mix": no such variable
    while executing
"if {$dupl_mix} {
# POSSIBLE REDUNDANT
set pmask [OnlyForMix]
} else {
set pmask [GetProgsmask]
}"
    (procedure "RestoreInslessSystem" line 20)
    invoked from within
"RestoreInslessSystem"
    (procedure "CreateIns" line 239)
    invoked from within
"CreateIns"
    invoked from within
".workspace.1.a.top.machcr invoke"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 [list $w invoke]"
    (procedure "tk::ButtonUp" line 23)
    invoked from within
"tk::ButtonUp .workspace.1.a.top.machcr"
    (command bound to event)