General context: 

Launching TIMONE Plan

Problem that may occur:

It may happen that by performing a downgrade of TIMONE System and starting later clients, these should get in error (usually having a screen completely gray) because the preferences of the later versions have been enriched with new data and are no longer compatible.

Affected versions:

previous versions to 8.2.0

Resolved from version:

Starting from version 8.2.0 an advanced management of the preferences has been conceived that will avoid problems in case of downgrade, however this procedure remains valid for versions released until today.

On MAC OS X < 10.9 was sufficient to eliminate the folder PLAN_PRESETS (positioned in the home of the user) and the files it.tellnet.tiller.plist and it.tellnet.gem.plist (positioned in the Library Folder/Preferences of the user home; access from the Finder menu -> Go -> Library [the item appears if you hold down the Option key, see attached screenshot]).

Starting with MAC OS X 10.9 (Mavericks) was implemented a caching mechanism of preferences which negates the cancellation of the plist file; in order to overcome this drawback it is necessary to perform the following Terminal commands with clients closed prior to deleting the plist file:

$ defaults delete it.tellnet.timone

$ defaults delete it.tellnet.gemma

After the execution of the commands you can proceed to the cancellation of the plist file and the start up of the client, which will restore the default preference.