Common flop situations

[mc1023]

I've been folding situations like this on the flop fairly often but I can't seem to recollect why, just been doing it by instinct lately. I also tend to avoid spots like these when I'm 6-8tabling, is that a leak?

Typical Partypoker 30-60, 10 Handed

Situation #1

Preflop: Hero is SB with J [img]/images/graemlins/spade.gif[/img]6 [img]/images/graemlins/diamond.gif[/img]
UTG+1 calls, UTG+2 calls, all fold, button calls, Hero complete, BB checks.

Flop: Q [img]/images/graemlins/spade.gif[/img]T [img]/images/graemlins/diamond.gif[/img]9 [img]/images/graemlins/diamond.gif[/img] (5sb)
Hero check, BB check, UTG+1 check, UTG+2 bets, button folds, Hero folds...

Situation #2

Preflop: Hero is SB with J [img]/images/graemlins/spade.gif[/img]6 [img]/images/graemlins/diamond.gif[/img]
UTG+1 calls, all fold, CO calls, Hero completes, BB check.

Flop: Q [img]/images/graemlins/spade.gif[/img]T [img]/images/graemlins/diamond.gif[/img]9 [img]/images/graemlins/diamond.gif[/img] (4sb)
Hero check, BB check, UTG+1 check, CO bets, Hero folds...

someone care to refresh my memory please.

RE-EDIT: would it be any different if you were BB?