Passing Array Losing Items: Lost 'control'

Passing an array from a sub to another sometimes works, sometimes not. But when I call the same sub twice, it definately gets stuck at least at the second time. Seems as if I tend to lose some of my items of the array. And I cannot figure out why it happens, at what pace it happens or how I could stop this from happening.

1.Could it be that a control perishes as soon as it is set to 'ctrl.enabled=false'? 2.Or could it be that a declared array 'ary=array(tb1,cb1,frm1)' can not be handled without having had its items initialized with some lines of code, although the items visibly exist within the user form? 3. Can it be that a Sub 'remembers' the former values passed to it, if set to 'optional'?

However, I have added a cleared/minimized version of my userform as a file to this post, hoping that some of you out there might find the time to have a look at it.... I would really appreciate it. I have added the decisive parts of the macro below here, as well,

Private Sub UserForm_Initialize()
Dim elem As Variant
Dim wSht As Worksheet
Dim ctrl As Control
'set control arrays
'[...]
ctrlAllStep2 = Array(cbTimeOnly, cbIntensityOnly, cbAreaOnly) '[...]
ctrlAllStep3 = Array(tbIntensityTotal, tbIntensityBleached) '[...]

MsgBox "Two Controls exist now: 1." & ctrlAllStep2(0). name & ", 2. " & ctrlAllStep2(1).name, vbInformation, "Note: controls exist..."
'disable Controls in Step2 and in Step3....................