I have been using VS2019 and VS2022 for many years, and for a year or so on a project using a Pico card using the Earl Philhower Pico library.  I didn't do anything on it for a month or so, and when I got back to it, when I compiled and downloaded the program the card did nothing, not even showing a Com port any more.  After trying a few different Pico cards, I though I might have updated the Philhower library, and I did change a few lines of code, so I started to figure out what was wrong. I tried many things starting with going to older versions of my program, (by booting the Pico holding down the button so it appeared on my system as a USB drive), reinstalling to an older version of the Pico board library, and ending with a simple "Blink" program, all to no avail.

I finally tried to compile with the Arduino IDE, and everything, Blink and the larger project, worked properly.

I just tried to install an older version (25.0314.1) of Visual Micro, but is still does not work.  In going to the older version, I had to uninstall the newer one first, so theoretically, it should have reset everything to 'defaults', and I have checked all the "Option" parameters and they match the Arduino 2.3.5 parameters, so I'm at a loss.

I've attached the Build Properties text file. and since the zip of the folder with the project is "too large" to attach, here is a link to the zipped Blink program I created, which will also have the Solution and project files: 
https://www.dropbox.com/scl/fi/193l7jfes0gg816us6c66/PicoBlink.zip?rlkey=405c8h2...

I disabled the Stack Protector, and that seems to have fixed the issue.  I don't remember adding that,. but it does seem to be default disabled in the Arduino IDE, I missed that.

I suppose I should add the bool core1_separate_stack = true; to increase the stack sizes.

Any explanation why that causes an issue, even on a project with minimal stack and single core?