Bukkit

What steps will reproduce the problem?
1. change trading attributes in yml file
2.
3.

What is the expected output? What do you see instead?

What version of the product are you using?
version for 1.4.7

Do you have an error log of what happened?
there was no error log

Please provide any additional information below.
after i edited the yml villagers would no longer trade. the default yml back in its place, they still will not trade. I removed the plugin, and they still will not trade...

"I removed the plugin, and they still will not trade..."

Are their offers disabled? Like, is there a red X in the trade offer? This plugin has config to change the amount of times a trade can be used before it is locked - if you made that very small (or possibly made it so offers are locked by default), this change will stick with the offers it has effected. You can't unlock an offer in-game unless the last offer is open (in which case, trading with it will unlock all other offers), and the last offer should never get locked regardless of config. If that's what's going on, that's a bug.

If you mean something else by "villagers won't trade", please be more specific. Do they have no trade offers? Do you trade them, and then the trade gets undone? Can you even bring up the trading screen?

If you have the Shopkeepers plugin (or possibly any other trading plugin), know that it literally stops vanilla-spawned villagers from trading: you have to configure that plugin so it stops blocking trading - then the problem has nothing to do with this plugin.