I just posted a new thread. It appeared for about 30 seconds and then disppeared.  Any idea what that's all about?

Off topic perhaps.

my post was concerning fletching shape...i.e. traditional cut vs shield or other cuts.  If that's off-topic, where should I post?

Looks like it was moved to PowWow. Your other thread will probably be moved there also.

There is an arrow section also.

ok.  thanks.

Your welcome, pow wow might be your best place though.