Screen Updating = True Msg Box "done" End Subthank you vbfbryce I'll try and check that out as soon as I get to an Excel 2013 Meanwhile I can add something that could help you help me out I get the unwanted flickering occurs while switching between workbooks.i must admit that my Screen Update does not help to make the code readable so this mistake could have happened to many of us...

and then I also put calls to my Screen Updatejust(True, previous Screen Update) at the end of every procedure to set it back to its previuous value so the issue could be the my Screen Updatejust() doesn't work properly @DS: I always use my Screen Update() in the following way - first to set Application.

Screen Updating to its previuos value, not necessarily to True.

this to mantain possible settings to False coming from calling subs Am I missing something?

i do my best to test code works before i post it, but sometimes am unable to do so for some reason, and usually say so if this is the case. Screen Updating = True End If For j = 1 To 200000 ws. Finally I must add that those two Excel run on different machines: Excel 2010 with W7 and Excel 2013 with W8 I think that's all, for now you should avoid any code that selects or activates anything, work with fully qualified ranges instead of selection i believe that screenupdating can only be relied on to work correctly within the procedure it is called, if in doubt just put at the beginning of every procedure i do my best to test code works before i post it, but sometimes am unable to do so for some reason, and usually say so if this is the case.

Note code snippets posted are just that and do not include error handling that is required in real world applications, but avoid On Error Resume Next Sub put Numbers In Cells() Dim ws As Worksheet Dim j As Long Dim resp As Integer Set ws = Active Sheet resp = Msg Box("Turn off updating? Note code snippets posted are just that and do not include error handling that is required in real world applications, but avoid On Error Resume Next dim previous Screen Update as boolean Call my Screen Update(False, previous Screen Update) 'to get the current setting into previous Screen Update Call my Screen Update(True, false) 'to set updating to false 'do your heavy code here and when finished: Call my Screen Update(True, previous Screen Update)maybe you have fiddled around with the code and thought the first "Call my Screen Update(True, previous Screen Update)" is useless/wrong?

Screen Updating = True Msg Box "done" End Sub Sub put Numbers In Cells() Dim ws As Worksheet Dim j As Long Dim resp As Integer Set ws = Active Sheet resp = Msg Box("Turn off updating? Screen Updating = previous Screen Update Else previous Screen Update = Application. Screen Updating = False End If End Sub And there I found that the first call (and the second too, I guess) was uneffective Can it be it's because of some maliciuos interaction between Application. But always remind that I get no flickering in Excel 2010.

Screen Updating = True End If For j = 1 To 200000 ws. So I put breaking points in every line code calling any "activate" method (cell, worksheet, workbook) checking for "? Screen Updating" in the immediate window and finding out that it was set to "True" even if I managed to set it to "False" before that "activate" call. Screen Updating setting, which follows Sub my Screen Update(screen Update Request As Boolean, previous Screen Update As Boolean) If screen Update Request Then Application. Since they get set in quite a mixed mode along the code: somtimes the former before the latter and sometimes in reverse.

- still, I have that flickering with excel 2013-W8 and not with excel 2010-W7 since the main sub (and those called by it) has to open all those many workbooks, for reading data inside them, I'm starting to think flickering is due to this.

but with no idea of why should that happen with excel 2013-W8 only.