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


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.