Turning off Screen updating should fix the blinking but the
underlying cause is probably changing the active cell
and/or active worksheet while running a macro, which
is bad coding. http://www.mvps.org/dmcritchie/excel/slowresp.htm
Turning off calculation during the running of a macro
will speed up the macro considerably.
If you are not using macro or user defined functions, you
probably have some serious problem such as misuse of
SUM Worksheet Function (overlapping SUMs) causing
lots and lots of recalculations.
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