Discovered this during year-end reconciliation. When you purchase a CD on the secondary market, there is usually accrued interest at the time of purchase. The Quicken interface is mistakenly picking up this accrued interest amount and sending it across as a cash transaction, throwing the cash out of balance. It happened twice on two different CDs, so it's not a "blip." This is a "new trick" after the EWC+ interface conversion - everything worked properly before this.
If I delete these two transactions, everything is in perfect balance; however, I suspect that the tax reporting would now be off. Fortunately, I do not pull tax data from Quicken - using it, instead, as a check-and-balance system - so this isn't an issue for me (although it undoubtedly would be for others).
