Seems like you've found a bug in TC. I suggest you open a ticket via https://support.smartbear.com/testcomplete/message/
Here I meant TestComplete makes the Test App crash, However I have observed in 1-2 instances both TC and Test App became unresponsive. the object I am trying to map is not a directly visible object, it is inside popuproot which gets disappeared as soon as I click elsewhere. Even with opening TC on one screen and Test App on another does not help!
Champion Level 3TestComplete has trouble performing actions on objects in the test run if they are not visible on screen. It needs to be able to focus the object or it may just continue to search or hang waiting depending on your search settings and code. I have seen cases myself where a popup root is not located in the object tree under the parent object but under the Sys root of the tree or even another app process.
Just some ideas to check. Good luck!
