Often the name modification (or "mod" for short) is used interchangeably with AddOn. More specifically, a mod is a third-party AddOn that alters or enhances some aspect of the game's interface. Mods can perform a wide variety of tasks, including adding new buttons to the screen, altering the built-in player and party frames. In extreme cases, mods completely supplant the standard game's interface, usually offering more advanced functionality.
As of Patch 2.3, if you get a message "Interface action failed because of an AddOn", this means that an AddOn interfered with the Blizzard UI in some way. To diagnose this, enter the following into chat "/console taintLog 1" and restart the game and try to reproduce it. If you reproduce it, you can quit the game and search through the file Logs\taint.log for the word "blocked" and mail the log to the author of the AddOn listed there. Once you have done this you can turn off logging by entering the following into chat "/console taintLog 0"

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It showed what items were on the rise, which ones were stagnant, and which ones were going down. I don't know how accurate it is since I am not familiar with my realms AH yet. I put some things on the AH with the Zygor suggested price and sold about 5k worth of stuff (I had a ton of MoP gems/herbs sitting around). I did use TSM suggestions as well and for the most part they seemed pretty close. But I did do an AH scan with Zygor before posting.

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