I've seen the posts on this for well over a year and I can duplicate this 100% of the time. Due to Quickens OSU not always working, and the need to constantly deactivate/reactivate accounts for transactions to download, every time I do this (for Amex, Citi, and Chase at least—possibly more), the Opening Balance "issue" shows up (where Quicken puts in an erroneous opening balance), which of course, messes up the correct/real balance.
I know now to remember to manually check each account every time I have to go through this and delete the erroneous entry but I would think that this issue would be more important to fix than adding some of the new features in the various quarterly updates.