Reports "Flashing" On Open

[Wayne]

If I open a report using this code it "flashes" as it opens:

DoCmd.OpenReport "NumbersByDate", acViewPreview
DoCmd.Maximize

This is probably to be expected.

If I open the same report using this code it still flashes:

DoCmd.Echo False
DoCmd.OpenReport "NumbersByDate", acViewPreview
DoCmd.Maximize
DoCmd.Echo True

From what I've read after searching on this subject, the Echo command

should fix the flashing, but it doesn't make any difference.

If I open the same report using this code it opens OK and doesn't
flash:

DoCmd.Echo False
DoCmd.OpenReport "NumbersByDate", acViewPreview, , , acHidden
DoCmd.Maximize
DoCmd.Echo True

I don't understand (a) why I can still see the report when I've told it
to be hidden and (b) why telling it to be hidden stops the flashing.
Any help would be appreciated.