Quicken's checking register balance a problem vs Wells Fargo online balance

Question

I reconcile WFB accounts each month. They match identically then and during the month with the online balance. However Monday I ran an update of my checking account and suddenly the Quicken balance is off by a huge $$ amount, significantly less than my bank's online balance. I can't find anything written to help me diagnose this issue.

NotACPA · Answer

After that, look at TRANSFERS between accounts ... because you can't delete just one side of a transfer.  Any deletion removes both sides.

q_lurker · Answer

first place I’d look is the Opening Balance transaction.