A couple of questions for a project gone wrong using Mahogany

All, I had a problem today while using some Mahogany I had glued up trying to make a handle for a drawbore pin. I was planing the wood down to size and noticed that there was white stuff in the wood grain as I planed, I had not planed this wood before, so I don’t know if this is normal or not? Any thoughts? Here is a picture:
http://i508.photobucket.com/albums/s326/delaneypj/tool%20cabinet/100_1687.jpg

I also had a problem where I got to the point in the project where I had just heated up the drift pin and was tapping the handle down on top of the drift pin. After the handle was fully seated, I noticed a gap started to appear on the glue line btwn the two pieces I had glued up for the handle blank. Within about 30-60 seconds the two pieces came apart at the glue line, bummer. I had never experience this before where the glue had failed, the pieces had been glued up for 24hrs and I used plenty of glue. Any thoughts? Is there something special to Mahogany that has to be done to it before applying glue? I used Titebond yellow glue and it is not old. FYI, I used the same glue on two pieces of oak earlier this week and that handle also failed. That time it split the handle apart as I was seating the handle down on top of the drift pin, but it failed along some wood grain and not the glue line (it failed because I had drilled the hole in the handle to small for the pin).
Any help or advice anyone could provide would be greatly appreciated, thanks in advance.

-- "You get what you inspect, not what you expect"