Gentlemen, allow me to inject:http://www.zenit.org/article-14363?l=english
“After Communion the faithful are free to adopt the posture most consonant with their physical possibilities and personal devotion, whether kneeling, standing or seated.”
From the GIRM 43:
“…as circumstances allow, they may sit or kneel while the period of sacred silence after Communion is observed.”
I don't see any instruction that tells me I must defer to the personal preference of a bishop nor do I read that the bishop can issue an instruction forbidding me from exhibiting a proper sign of reverence to Our Lord.
Keep in mind there are three issues woven into this thread (and now possibly a fourth, with the introduction of the posture to be taken before going up to receive). The sign of reverence
to be used before reception, the posture
to be taken after reception, and the posture
to be assumed during reception.
A word of caution to remember what the original subject of the thread was (the sign of reverence
to be made just before receiving communion) and to not confuse the issues.
A word regarding deference to the "personal preference of a bishop," as if the bishop is somehow just Rome's toady, this is in Canon Law:
Can. 381 §1. A diocesan bishop in the diocese entrusted to him has all ordinary, proper, and immediate power which is required for the exercise of his pastoral function except for cases which the law or a decree of the Supreme Pontiff reserves to the supreme authority or to another ecclesiastical authority.
Pastoral function being made up of the threefold munera of teaching, sanctifying (sanctifying = liturgy), and governing. Therefore, while perhaps one can make a case that governance of the posture to be taken after reception has been delegated to the bishops conference, and therefore the individual bishop is not legitimately able to modify this for his diocese (I'm not able to argue one way or the other), I would not
go so far as to discount the authority one's own bishop has to compel one to do "this or that" when it comes to the liturgy. A diocesan bishop does in fact have great authority within his own diocese to bind and loose. In effect, he is "pope" of his diocese, and those (relatively few) areas not reserved to another ecclesiastical authority, such as the Pope, are the diocesan bishop's to decide.