looking on a solution for
http://www.open-mpi.org/community/lists/users/2012/10/20495.php

I noticed that the issue disappears on 1.6.2 with the patch:

----------------------------------------------------------------
--- opal/util/path.c~   2012-04-03 16:29:52.000000000 +0200
+++ opal/util/path.c    2012-10-30 20:31:43.772749400 +0100
@@ -82,7 +82,7 @@

     /* If absolute path is given, return it without searching. */
     if( opal_path_is_absolute(fname) ) {
-        return opal_path_access(fname, "", mode);
+        return opal_path_access(fname, NULL , mode);
     }

     /* Initialize. */
----------------------------------------------------------------


For what I can see on the function body, the test on path
is expecting path to be a null pointer and not a
pointer to an empty strings

----------------------------------------------------------------
char *opal_path_access(char *fname, char *path, int mode)
{
    char *fullpath = NULL;
    struct stat buf;

    /* Allocate space for the full pathname. */
    if (NULL == path) {
        fullpath = opal_os_path(false, fname, NULL);
    } else {
        fullpath = opal_os_path(false, path, fname, NULL);
    }
    if (NULL == fullpath)
        return NULL;
----------------------------------------------------------------

Regards
Marco

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