I've tried all combinations: \n, \n\r, \r\n, and \r but BlockByText still fails to find the button. When recording, TC seems to use absolute screen coordinates in most cases (i.e., specifies specific X and Y coordinate to click). In one case, recording did generate an OCR CheckText call with "*Log\nIn*" string. However, if I use that same string within BlockByText, TC still fails to find it.
If it was working before upgrading TC, then it could be an issue with the latest version.
I suggest you open a ticket via https://support.smartbear.com/testcomplete/message/
