Quicken still crashes on close. Additional information I can provide ...
1) If I recover from a back up, it works ... once. After I open it a second time it will crash upon close again.
2) If I do not open the file, I can perform a Super Validate on the file. It does not find anything. Upon completing the Super Validate, the file is open and I can close the file without it crashing. Upon opening the file a second time it will crash on closing.
3) This all started immediately upon updating to R25.10.
Best guess ... when R25.10 closes the file, it corrupts something such that every file close after that Quicken errors out.