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Trouble with (system)

hello,
The procedure "system" freezes my application after doing the system
command correctly. I followed the debugger (DDD/gdb) up to here:

gh_eval_str_with_catch (scheme_code=0x80ff050 "(system \"who\")",
       handler=0x80532b0 <exception_handler>) at gh_eval.c:78

The program just gets "stuck".
I am using libguile 1.3.1 on SuSE 5.2 in an X client. ANy help please?
Tano Fotang.
---
int parse_scheme(const char *str, int win)
{
   SCM ret = gh_eval_str_with_catch((char *) str, &exception_handler);
   ....
}