When scheduling an activity, the 'Link To' field allows you to leave it blank...or select from Quote, Project, etc. If I select Project (or any of the choices)...and then decide I do not want it linked to anything, I cannot clear the field. I have tried to delete or backspace over it, and I cannot. I think there needs to be a 'None' choice so that people who inadvertantly select something and fill out the activity, can reset it to blank without having to cancel the activity and start over.
The version number I am using is 1.90.3383.1. It is running a demo license right now (that is soon to change!)