TPTK on button v.s. weird betting

[bobdibble]

UTG+1 maybe loose passive (20 hands, vpip 50, 0 pfr, 0.5 ta)
SB and BB are LAGs (>60 vpip, >20 pfr, but low ta)

What is with the switch from SB to BB leading on the turn?

And what about UTG+1 waking up on the the river? Flush, straight, 2-pair or just something like 9x and doesn't want overcallers?

Anway, I am looking for general feedback. How is the agression on the flop and the turn? Good or bad river fold?

Party Poker 1/2 Hold'em (6 max, 5 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is Button with T/images/graemlins/spade.gif, A/images/graemlins/club.gif.
UTG calls, UTG+1 calls, <font color="CC3333">Hero raises</font>, <font color="CC3333">SB 3-bets</font>, BB calls, UTG folds, UTG+1 calls, Hero calls.

Flop: (13 SB) 3/images/graemlins/club.gif, T/images/graemlins/diamond.gif, 9/images/graemlins/diamond.gif <font color="blue">(4 players)</font>
<font color="CC3333">SB bets</font>, BB calls, UTG+1 calls, <font color="CC3333">Hero raises</font>, SB calls, BB calls, UTG+1 calls.

Turn: (10.50 BB) 4/images/graemlins/club.gif <font color="blue">(4 players)</font>
SB checks, <font color="CC3333">BB bets</font>, UTG+1 calls, <font color="CC3333">Hero raises</font>, SB calls, BB calls, UTG+1 calls.

River: (18.50 BB) 6/images/graemlins/club.gif <font color="blue">(4 players)</font>
SB checks, <font color="CC3333">BB bets</font>, <font color="CC3333">UTG+1 raises</font>, Hero folds, SB folds, BB calls.

Final Pot: 22.50 BB

[naphand]

Many players at $1/$2 will slow-play a flopped 2-pair, and BB could easily be hoping to raise SB on the Turn with T9, or other worse 2-pairs. Don't be surprised what people call with from the blinds, I've seen 3 bets called by the SB with K4o (split with AK on a KQQKx board). SB said he "would have folded except he was playing a blind...". Go figure.

Most players freeze up to a 3-suited board, some won't bet a 2-suited board until the River card comes and no flush is possible, some wait for the Turn to be safe. They are permanently terrified of losing a big pot to a flush. 2-pair is a slow-play regardless of the board (and if it is 3-suited, is never gets raised, but they still call).

UTG+1 waking up is certainly a better hand than yours. Good fold, lots of draws made it.