I need to make my form not resize to anything smaller than...

[Milk]

I removed that and it crashes...

You do have to be careful when sub classing

Did you remove

 'Keep the form only as wide as MAX_WIDTH
        If (r.RIGHT - r.Left > MAX_WIDTH) Then
            Select Case wParam
                Case WMSZ_LEFT, WMSZ_BOTTOMLEFT, WMSZ_TOPLEFT
                    r.Left = r.RIGHT - MAX_WIDTH
                Case WMSZ_RIGHT, WMSZ_BOTTOMRIGHT, WMSZ_TOPRIGHT
                    r.RIGHT = r.Left + MAX_WIDTH
            End Select
        End If
        
        'Keep the form only as tall as MAX_HEIGHT
        If (r.Bottom - r.Top > MAX_HEIGHT) Then
            Select Case wParam
                Case WMSZ_TOP, WMSZ_TOPLEFT, WMSZ_TOPRIGHT
                    r.Top = r.Bottom - MAX_HEIGHT
                Case WMSZ_BOTTOM, WMSZ_BOTTOMLEFT, WMSZ_BOTTOMRIGHT
                    r.Bottom = r.Top + MAX_HEIGHT
            End Select
        End If

because thats what I meant and it works for me.

[PKDEB]

The other way around is to put the resize command at Mouse Up event. So let the user resize the window as they like but once the Mouse up event occurs, it will be back to the desired size.

At lease there will no flickering, i promise