I have been having this problem with VFV and VRN from time to time. Today CNQ, VFV and VRN are not updating. I can find data on the BMO InvestorLine website and through the search function on Google Chrome but Quicken Classic Business and Personal is not updating these two stocks (CNQ & VRN) and one ETF (VFV).
Often with VFV and VRN it can be fixed by opening Edit Security for each and closing without editing. This work around is not working today.