Seller may be obligated to still pay commission (to the previous listing broker) for a period of usually 3 months after the listing terminates, if sold to anyone who saw the house while it was listed. It's called a protection clause. Every once in a while, the listing broker gives the sellers a waiver and there is no protection clause in place.
Using your previous agent may allow you to find out if there is a protection clause still in effect, and assuming your previous agent worked hard for you to find you a home, he/she will get paid for the efforts.
If your are unhappy with the services of the agent that showed you the home, then that is a different matter. You should work with an agent who has earned your trust for sure.
But as a general response, I would say, highly likely seller is obligated to pay commission for period of time under protection clausse of listing agreement for buyers who saw the property while listed. If that time period has not lapsed, then I see no benefit if workind around the agent - in fact the possible dispute may just muddy the water or slow you down.
Good luck to you,
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I would contact the broker you originally saw the home with. It doesn't cost you anything (commission wise) so let the agent do the work for you and see if the seller is still interested in selling the property. And as mentioned below, there is usually a Broker Protection clause in the listing agreement.
Good Luck to you!