Two problems, one with SDBG v5.1, one with FCORE4

First problem.

With v5.00 and v5.10, SDBG is, in one circumstance, stepping into the wrong routine. If I recompile with v4.90, it works OK. I suspect a simple example won't illustrate the problem. Hovering over the call statement shows the correct intended target subroutine (it's in the same source file).

What should I do next!?

Second problem.

I'm using the FCORE4 routine to get a real value from an address. However, for reasons that I haven't yet been able to isolate, that address has had an integer value posted into it, and it decodes as an invalid real. Is there a test I can peform to trap the error before it occurs?

K