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Is this error related to the one where you click sell, while "Market" is selected and your order gets placed as LIMIT instead?
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How often does this error happen? How do you place a market order, is the only way to click sell, while "Market" is selected?
Almost anytime you return to the tab with bitfinex and click buy/sell when the "MARKET" was selected previously. Also: market orders use to throw up random message of "selling under/over ticker price, you you really want to do this?!" That one happens so often it makes my ulcers laugh at me!