Thank you very much for offer of help it is much appreciated.The sequence I go through is as followsSelect an Investment accountSelect "enter transaction" buttonThe enter transaction screen appears as normal (PNG image attached). I can readily buy and sell existing securities.The problem arises when I select "Security name" followed by selecting "add security". I then get a blank screen except for the Q logo. {PNG image attached)I am using windows 10 and both Q18 and W10 are up to date .