Hello David,
The problem you describe can happen if recognition parameters TestComplete uses to map your button are not stable, for example, if one of the properties used to recognize your button changes its value every time you restart your application under test.
Could you please open the Name Mapping editor in TestComplete and check what properties and values are used to identify your button?
You can try to change your button's mapping criteria as described in the [url=
http://support.smartbear.com/viewarticle/28732/]"Modifying Mapping Criteria"[/url] section of the TestComplete Help system.
Please let us know if this does not help.
Thank you.
