The custom sort order specified contains one or more invalid column names: op_sys%2Cbug_status%2Cpriority%2Cassigned_to%2Cbug_id. They have been removed from the sort list.
Sun Mar 1 2015 11:37:52 EST
It's not a bug, it's an undocumented, untested feature that no-one coded.

Zarro Boogs found.
Edit Search  
as

File a new bug in the "tail_n_mail" product