@m.muell This isn’t a “glitch” however, the error message is a bit misleading. You were attempting to DELETE or close a INTC260710C00122000 position around 11:22 EDT. To do this, the system creates a market order to sell INTC260710C00122000. However, at the time the account did not actually have a INTC260710C00122000 position (it was closed previously at 09:32 EDT). Therefore, when attempting to sell INTC260710C00122000, the system thought you were trying to short INTC260710C00122000, which would have been uncovered and therefore rejected. Selling uncovered call options is not supported for level 3 option trading. But as noted, the error message is misleading and should have really simply said that the account did not have a INTC260710C00122000 position to close.