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Please post some more info to help people make a more informed guess :) What would be interesting is:

• Output of hector_mapping to the terminal

• Output of "rosnode info hector_mapping"

• The topic name of your laser scans

• The tf tree (are there both "base_frame" and "base_link" in it? If not, you should probably set the "base_frame" and "odom_frame" parameters both to "base_link").

Also, please edit your original posting to provide further info and do not post it as an answer :)