Eugene, Are you sure the router is accepting the commands ? I get the following error when i paste your sample config .
R1(config)#class-map type access-control match-all ICMP-FILTER-CM R1(config-cmap)#match start ICMP payload-start offset 0 size 2 string "FFFF" % Error - string specified is longer than the search space specified string FFFF is not 2 bytes, it should be 4 bytes.
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