The behavior you describe is typical of a corrupted runtime.dat file. Review this thread for solutions.
I agree that it does sound like a corrupted runtime.dat file issue. But I'm also embarrassed to see that my post referenced by @markus1957 has an error in it that I did not notice and correct earlier:
I hope anyone trying to use this "fix" process was able to figure out for themself the error and that it did not sideline anyone.
I have asked a Moderator to correct this since the thread is now closed and I can no longer do that myself.
UPDATE: A moderator did complete the correction in the linked post and it is also now corrected in this thread.
sometimes the Summary screen doesn't show some of the Accounts actually downloaded.
You can try UN-clicking the [x] at the bottom for the … [ ] Show just the Last Update
take a look at each Quicken Account - and note the download protocol..
Direct Connect - Express Web Connect - Express Web Connect +
Sometimes OSU Summary shows the last set of results by protocol “batch” … so some appear, and some don’t-