You may notice that if you set a scratch variable or reference a variable set in a search routine on the results page, the change does not stay in the user session.
To change this, set the scratch variable mv_put_session on the page in question:
[set mv_put_session]Yes[/set]
This setting is persistent, so it is recommended that you do it once at the beginning of the user session if you wish it to be the default. If you don't want it to be the default, reset it to the empty value (or zero) on another page:
[set mv_put_session][/set]