IM manager missing a lot of robots while available in usm

Document ID : KB000108978
Last Modified Date : 03/08/2018
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Issue:
IM manager missing a lot of robots while available in usm.
One particular hub only shows about 20 robots in IM while all 100+ robots are listed in USM.
Resolution:
Deleting  \hub\robot.sds and restarting the hub brought in 35 robots.
Only when hub\q\*.sds files were deleted as well all robots showed up in IM again after the restarting of the hub.