With Jailbreak iOS 8.3 using Taïg 2.1.2, tweaks and other packages need to do their update. This is the case of beta Activator developed by Ryan Petri, who has received a new version to run on a jailbroken device running iOS 8.3.
Activator is a very useful package, since it allows you to assign additional gestures in iOS. So you can start an application or action other than the predefined gesture by Apple.
To install this latest version, you will need to add the source in Cydia Ryan: http://rpetri.ch/repo.
Once done, simply go to its source and seek Activator beta and install it. Then you will enjoy again the joys of different gestures and many other settings.
For tutorials on how to jailbreak iOS 8.3 using TaiG: