$11: Level 1 weak-tightness -- is this a leak or a solid fold?

[spentrent]

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) converter

UTG+1 (t800)
UTG+2 (t770)
MP1 (t770)
Hero (t800)
MP3 (t995)
CO (t770)
Button (t745)
SB (t1340)
BB (t755)
UTG (t255)

Preflop: Hero is MP2 with 9[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
UTG calls t15, <font color="#666666">3 folds</font>, Hero calls t15, <font color="#666666">1 fold</font>, CO calls t15, Button calls t15, SB completes, BB checks.

Flop: (t87.50) 3[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB bets 75, UTG calls 75, Hero ???


BB's bet + UTG's call + 3 left to act causes Hero to autofold his overpair here. Solid poker or leaky poker?

In a cash game I'll raise here more often than not to try to isolate one of the villains in front, but in a Party-style tournament I don't want to spew chips this early.

Thoughts?