user form goes "blank" inside its borders

sometimes when i run code under a command button on a pop-up user form, the contents of the userform go "blank"
(i.e., border stays on, so you can see that the form is still there, but the contents are all "white"-you cannot read/see any of the content...

?what could be done to prevent this from happening (presently, i just have the mouse cursur displaying while code is running?

thank you.

Re: user form goes "blank" inside its borders

thank you...

doevents is testing well...

thank you.

Re: user form goes "blank" inside its borders

in further testing, i still loose the contents of the userform (seems the longer the code runs-based on a fitler, etc.

here's the code i added:
'...

Application.Calculation = xlCalculationManual    'manual calc
Application.ScreenUpdating = False
Application.DisplayAlerts = False
Application.StatusBar = "Building..."
DoEvents
' Create a variable to hold number of Visual Basic forms loaded
' and visible.
Dim I, OpenForms
For I = 1 To 150000    ' Start loop.
    If I Mod 1000 = 0 Then     ' If loop has repeated 1000 times.
        OpenForms = DoEvents    ' Yield to operating system.
    End If
Next I    ' Increment loop counter.


dim strFirstAddress As String
Dim rngPicked As Range
'...

thank you