(I have solved this. Posting it in case someone else is having this issue.)
I have an application that integrates with Quickbooks using the QBFC13 library. It all works great when running the application from Visual Studio. However, after publishing and installing as a ClickOnce application, the app crashes when calling the SessionManager.OpenConnection method.
The following is the EventViewer entry: Faulting application name: ******.exe, version: 1.0.0.0, time stamp: 0x5c9bc8e2 Faulting module name: ucrtbase.dll, version: 10.0.17763.348, time stamp: 0x93e4fbe5 Exception code: 0xc0000409 Fault offset: 0x000a3652 Faulting process id: 0x47d4 Faulting application start time: 0x01d4e4dd895421ae Faulting application path: C:\temp\test****.exe Faulting module path: C:\Windows\System32\ucrtbase.dll Report Id: a081e5b3-502b-4591-9fc7-429d5658dba4 Faulting package full name: Faulting package-relative application ID:
Turn off ClickOnce signing. Double click Properties. Then go to Signing tab and uncheck "Sign the ClickOnce Manifest".
I haven't figured out why this is a problem, but after switching it off and publishing again, the problem disappeared.