FIA issued technical directives before Imola GP, but did they have an effect?

In the week leading up to the Emilia-Romagna Grand Prix, the FIA clarified some aspects of the technical regulations through technical directives (TD) – which is a common procedure in itself. 
Autosport has learned that these were not actual changes to the regulations, but clarifications of what the rules specified and their intended purposes.
The first clarification involves materials used …Keep reading