After following the typical workaround required to increase/disable the Idle GUI Timeout (default 30 minutes) via this KB, the user is still logged out of the GUI after 30 minutes of inactivity.
This was a code bug introduced in the 7.0 code family where the necessary tweak to change the Idle Timeout did not work as expected.
This was permanently fixed in 7.5U2.
Upgrading to 7.5U2 or later will allow for the typical workaround to be successful once again.
7.0 - 7.5U1