Quicken (windows) updated today to R51.10, Build 27.1.51.10
After the update, several (but not all) of my investment accounts switched to simple tracking mode.
This happened before, I think sometime in fall of 2022, but not sure. At that time, I recall disabling an option in Preferences→Investments that was something like "enable simple investing". With the option disabled, Quicken was supposedly prevented from switching account tracking method.
I just checked and that option is no longer there. There is an option to "Default to simple investing for new accounts". That is not enabled.
So how do I prevent Quicken from switching tracking type in the future?
On a side note, I like the simple view, but I need the register based lot tracking. I wish Quicken had a simple view that was based on the underlying register entries. Like have tabs in the account to switch between simple/register. Or just have a button like the "Holdings" button that would open a simple view.
<edit> I wasn't paying enough attention when I was going through them to switch them back to "Complete" tracking. But I think only my Schwab accounts switched. Not Vanguard or Fidelity accounts. Again, I am not sure about that.