Symbol pollution between two versions of a library

I am having problems with a library that is calling a function defined within itself from a different version of the library.
My company has a core library (let's call it libcore) that handles abstracting across platforms a number of common, low-level functions. At some point in our history, we decided to start supporting Unicode for a toolkit used by third party developers. To accomplish this, we took our old library, redefined uses of char * to a custom string type and conditionally compiled the library to create a version that took in char *'s and a version that took in wchar_t *'s.
So, we have libcoreA.so and libcoreU.so. Our third party app loads the Unicode version of our library which dynamically loads a list of file format libraries which all depend on the Ascii version of our library. In this process, the file format libraries call a string copy function from libcoreA which is supposed to call a string length function from libcoreA.
However, in the call stack for a crash, we see:
[1] custom_strlen (from libcoreU) <-- Bad symbol! No biscuit!
[2] custom_strdup (from libcoreA)
[3] file_format_lib_setup (from file format library)
[4] init_format_list (from libcoreU)
[5] get_list_of_formats (from application)
All of these libraries are compiled with "-Bgroup -z defs" to avoid confusion. Usually, when we leave this out, it doesn't even run or it makes a mistake during a call from one library into another, but I've never seen this happen before with the Ascii lib trying to call a function within itself.
The top level application isn't compiled with "-Bgroup -z defs" because it can't be. (It's a MainWin compiled COM app and is always going to be missing mainwin_init. I don't even want to go there.) However, in the past, this has never caused a problem. The application links with libcoreU and then later dynamically loads and initializes libcoreA on its own. The obvious question is, "What have you changed?" Unfortunately, I don't know what has changed that could cause this.
Any suggestions? This problem is driving me mad because I can't figure out a way to debug it. Applications that load either the Ascii OR the Unicode libs don't have problems. Applications that load both suddenly do with this release.

You know, I think it sometimes takes making a fool of yourself publicly to finally catch your errors. I have a problem in my make file that was making the Ascii version of the library compile without "-Bgroup -z defs".
Ignore this thread.

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