Setting up a new TwsActiveX sheet for IB account. The API connects just fine and Account Info is also downloaded with no issues on the Account and Portfolio sheets. However, when I "Request Market Data" (CTRL-SHIFT-R) on the Ticker sheet, I get a compile error: "Argument Not Optional" The line of code highlighted in the debugger is: Call Util.ParseComboLegsIntoStruct(Cells(id, Columns(COLUMN_COMBOLEGS).column).value, objTWSControl.m_contractInfo.ComboLegs) Anybody experience this? Have a fix? I have not tweaked or edited the file or code in any way. Thanks!