I posted the following in a different thread:
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opened the db with sqlitespy, selected the 'application' table
saw one row without an image_name (which is reported as "other" by networx)
changed the user_name of the row with no image_name to "ddd" (won't ever be a user with name "ddd"
edited all data_in and data_out values to zero
closed the db
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started networx (installed version)
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connected to internet, after 30+ minutes, I confirmed that 'unknown' no longer reports data_in or data_out.
Therefore, changing the user_name of the 'unknown' row to a 'non-existent user_name' is a good thing to do. It really should be done by networx and never be used as a real user_name.
Note: the 'unknown' traffic is a 'ghost', it was never transmitted through my router or measured by my ISP.
However it may affect the Networx quota (I didn't check this...yet

.
J
Edit: PS
Andrew, When I reverted from 5.2.8 to 5.2.7 I used sqlitespy to DROP Table "Applications". Now when I just updated 5.2.8 over top, it didn't create the table. Is there a way to get the table back without losing all the history?
I know that I can force the current months totals into a new, fresh copy of the db without too much trouble but doing this for all the prior months would be tedious (if I uninstalled NW and installed a fresh copy of 5.2.8 with an empty db).