/follow is broken by any movement that a character makes independantly. You will either need to hit your follow macro again or get JAmba to configure strobing follow.

It is the same with /assist. These are not permanent commands you will need to reestablish them all the time.

If you are using Keyclone, you can e-mail Rob at the address listed in the Keyclone FAQ on the Keyclone site to get a new license whenever you get the expired message.