Sudden long load time after Session edit.

Opening a session immediately after editing can corrupt the session causing excessive future loading times. (Will eventually load).

I have found that if I wait until the old AURAN spinning semi-circle flashes in the middle of the 'Select Session' window, (around 5-6 seconds), I have no problem.

There's nothing wrong except the load time is long and annoying. If you check the logs while the session is loading the first time, you'll see that this is due to the changes you made to session are being cached.