The editor appears to retain text which was edited out. A CTL-F search verifies that the text was successfully deleted. It smells like a bad cache flush or equivalent. The error message, triggered by the deleted text it the following:
C:\Arduino Working Files\Arduino Thermocouple Files\Arduino\ThermoAug\ThermoAug\ThermoAug - Copy.cpp:72:32: error: no 'void ThermoAug::echoCheck()' member function declared in class 'ThermoAug'
Anyone seen anything like it?