This is the same problem as described by @prestonforman in a discussion titled Verify Cash Balance that opened on 5/17 was closed without resolution.
The problem occurs almost daily when I finish accepting or deleting downloaded transactions from Schwab via One Step Update. It shows up in one or some but not necessarily all accounts that have transactions downloaded. It happens in both retirement accounts (with cash balance carried in the same account) and with regular taxable brokerage accounts that have a separate cash/checking account attached.
A screenshot of an instance of this problem seen today is attached. This is for a retirement account. The account has a future transaction recorded, but whether I happen to have entered a future-dated transaction does not seem to influence whether or not this error occurs.
Note that all cash balances agree (today's closing cash balance in the most recent cleared transaction, the predicted cash balance including the future transaction, the Cash Balance at the bottom of the register, as well as both figures shown in the pop-up box, the Last downloaded cash balance and the default Verify or update cash balance amount. If this were a brokerage account with a linked checking account, the balance shown in the Account panel would also agree.
Hitting "Done" in the pop-up box creates a reconciling transaction which changes the (correct!) balance in the register to something incorrect.
This has been happening for several months. This is not related to the incorrect Schwab downloaded transaction date problem, which started much more recently.
How do I (and others) stop this error from recurring?
I am using Windows Quicken Classic Premier desktop (currently Ver. R58.9/Build 27.1.28.9), on either Windows 10 Pro or either Windows 11 Pro (I recently upgraded, but this issue was not affected.)