No debug information in 10.56?

As soon as I descend below main.c, the 10.56 debugger cannot display any variables. If I try to add watch points, I get assertion failures.

Lib.dir looks like this:

In Lib dir, I search the standard libs, exclude my RCS directory, and specifically pick up my standard typedefs and a device driver file. The module header in device.c is correct. I call a number of cofunctions in device.c and the debugger can’t display any variable data as soon as I step into them.

The device routines are all cofunctions.

Why can’t the IDE find any of my symbols?