diff -rNu fluxbox-0.9.10/src/FbTk/XmbFontImp.cc fluxbox-0.9.10-utf8-fix/src/FbTk/XmbFontImp.cc
--- fluxbox-0.9.10/src/FbTk/XmbFontImp.cc	2004-09-28 10:18:00.000000000 +0300
+++ fluxbox-0.9.10-utf8-fix/src/FbTk/XmbFontImp.cc	2004-09-29 15:47:00.141972304 +0300
@@ -136,11 +136,27 @@
     int nmissing, pixel_size = 0, buf_size = 0;
     char weight[FONT_ELEMENT_SIZE], slant[FONT_ELEMENT_SIZE];
     char * orig_locale = "";
+    char orig_storage[128] = { 0 };
 
 #ifdef HAVE_SETLOCALE
     if (utf8mode) {
         orig_locale = setlocale(LC_CTYPE, NULL);
         setlocale(LC_CTYPE, "UTF-8");
+        memcpy(orig_storage, orig_locale,
+            strlen(orig_locale) > 127 ? 127 : strlen(orig_locale));
+        orig_locale = orig_storage;
+        /*
+         *  man setlocale says, that returned string
+         *  is pointer to a static storage. So --- simply keep a copy
+         *  of original string between further calls to setlocale.
+         *
+         *  It appears, that area, being pointed to by orig_locale (got
+         *  from 1st call to setlocale) is changed after subsequent call,
+         *  thus string in orig_locale is invalid, causing
+         *     setlocale(LC_CTYPE, orig_locale)
+         *  to fallback to "C" locale. And this causes invalid FontSet to
+         *  be returned => wrong window titles ;)
+         */
     }
 #endif // HAVE_SETLOCALE
     fs = XCreateFontSet(display,