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If rviz gives you an error you can always try removing the temporary folder created by rviz. considering you are in home directory
rm -rf .rviz
Now restart the rviz.
If kinect_detect gives you a segmentation fault even after the above changes, then just re build it once again by assuming you are in ppl_detection package path
make
now do
rosrun ppl_detection kinect_detect
hope it helps :)