It's not poor English, but I personally find it not very gracious. You're welcome My pleasure. Happy to help.
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AnonymousIs responding to a thank you with "not a problem" poor english?"Not a problem" or "No problem" is casual English -- not ungrammatical English. In the Midwest, they even say "You bet" or "Sure thing" in response to "Thank you". Many of these formulas are not necessarily logical. They are merely traditional.