Hi,
> I have dug through everywhere I can think to look, but cannot find exactly where it is trying to perform this conversion.
Double-click on the error line in the log. This should navigate you to the operation / line of code that errored-out.
Double-clicking the exception takes me to the Operation of the Object Checkpoint, but it does not help me locate what part of the Object is causing the error. It is a large object, with a lot of tables, panels, and cells that it is using as reference to check against, but that is all condensed into the one object checkpoint.
I'd say that you're running into a TestComplete bug. You should continue this in a support case.
To isolate this you'll probably have to perform a search . . . removing properties from the stored baseline object in an effort to pinpoint which property is causing the problem. Because of the error message (string to double), I'd start with any tables containing numbers.
