diff --git a/configure.in b/configure.in
index ec1c504..ffe4ac4 100644
--- a/configure.in
+++ b/configure.in
@@ -13,7 +13,7 @@ dnl micro version = incremented when implementation-only
 dnl                 changes are made
 dnl ---
 JACK_MAJOR_VERSION=0
-JACK_MINOR_VERSION=68
+JACK_MINOR_VERSION=69
 JACK_MICRO_VERSION=0
 
 dnl ---
@@ -41,7 +41,7 @@ dnl slacker than this, and closer to those for the JACK version
 dnl number.
 dnl ---
 JACK_API_CURRENT=0
-JACK_API_REVISION=18
+JACK_API_REVISION=19
 JACK_API_AGE=0
 
 AC_SUBST(JACK_MAJOR_VERSION)
@@ -87,12 +87,19 @@ dnl look for system support for POSIX shm API
 dnl XXX this could probably be improved
 dnl
 
+AC_ARG_ENABLE(sysv-shm, [  --enable-sysv-shm       use System V shm API even if POSIX API is supported ])
+
 AC_MSG_CHECKING([POSIX shm support (compile time)])
 df | grep -s /dev/shm >/dev/null 2>&1
 if test $? = 0 ; then
-   SHM_FLAGS=-DUSE_POSIX_SHM
-   AC_MSG_RESULT([found.
-	JACK will use shm_open() and friends])
+   if test "x$enable-sysv-shm" = "xno" ; then
+        SHM_FLAGS=-DUSE_POSIX_SHM
+        AC_MSG_RESULT([found.
+	     JACK will use shm_open() and friends.])
+   else 
+        AC_MSG_RESULT([found.
+	     But JACK will use shmget() and friends because you asked for it.])
+   fi
 else
    AC_MSG_RESULT([not found. 
 	JACK will use System V shm API (shmget() and friends])
diff --git a/example-clients/capture_client.c b/example-clients/capture_client.c
index e97335d..cc19315 100644
--- a/example-clients/capture_client.c
+++ b/example-clients/capture_client.c
@@ -127,7 +127,7 @@ disk_thread (void *arg)
 	unsigned int chn;
 	jack_nframes_t total_captured = 0;
 	int done = 0;
-	double *fbuf;
+	float *fbuf;
 
 	pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 	pthread_mutex_lock (&buffer_lock);
@@ -147,11 +147,11 @@ disk_thread (void *arg)
 		while ((buf = get_write_buffer ()) != 0) {
 			pthread_mutex_unlock (&buffer_lock);
 
-			/* grrr ... libsndfile doesn't do float data yet, only double */
+			/* libsndfile requires interleaved data */
 			
 			if (info->can_capture) {
 
-				fbuf = (double *) malloc (sizeof (double) * buf->nframes * info->channels);
+				fbuf = (float *) malloc (sizeof (float) * buf->nframes * info->channels);
 
 				for (chn = 0; chn < info->channels; chn++) {
 					for (i = 0; i < buf->nframes; i++) {
@@ -159,7 +159,7 @@ disk_thread (void *arg)
 					}
 				}
 				
-				if (sf_writef_double (info->sf, fbuf, buf->nframes) != (sf_count_t)buf->nframes) {
+				if (sf_writef_float (info->sf, fbuf, buf->nframes) != (sf_count_t)buf->nframes) {
 					char errstr[256];
 					sf_error_str (0, errstr, sizeof (errstr) - 1);
 					fprintf (stderr, "cannot write data to sndfile (%s)\n", errstr);
diff --git a/jackd/engine.c b/jackd/engine.c
index 08ee9d3..48b854e 100644
--- a/jackd/engine.c
+++ b/jackd/engine.c
@@ -55,7 +55,13 @@
  * Time to wait for clients in msecs. Used when jackd is 
  * run in non-ASIO mode and without realtime priority enabled.
  */
+#define DEBUGGING_SLOW_CLIENTS
+
+#ifdef DEBUGGING_SLOW_CLIENTS
+#define JACKD_SOFT_MODE_TIMEOUT 5000
+#else
 #define JACKD_SOFT_MODE_TIMEOUT 500
+#endif
 
 #define JACK_ERROR_WITH_SOCKETS 10000000
 
diff --git a/libjack/shm.c b/libjack/shm.c
index ba95e29..d528520 100644
--- a/libjack/shm.c
+++ b/libjack/shm.c
@@ -64,6 +64,12 @@ jack_initialize_shm ()
 	void *addr;
 	int id;
 
+#ifdef USE_POSIX_SHM
+	fprintf (stderr, "JACK compiled with POSIX SHM support\n");
+#else
+	fprintf (stderr, "JACK compiled with System V SHM support\n");
+#endif
+
 	if (jack_shm_registry != NULL) {
 		return 0;
 	}
@@ -82,7 +88,7 @@ jack_initialize_shm ()
 	jack_shm_registry = (jack_shm_registry_entry_t *) addr;
 	jack_shm_id_cnt = 0;
 	
-	jack_register_shm("/jack-shm-registry", addr, id);
+	jack_register_shm ("/jack-shm-registry", addr, id);
 
 	return 0;
 }
@@ -264,23 +270,43 @@ jack_get_shm (const char *shm_name, size_t size, int perm, int mode, int prot, i
 		unlink (path);
 		return MAP_FAILED;
 	}
+	
+	/* XXX need to figure out how to do this without causing the inode reallocation
+	   the next time this function is called resulting in ftok() returning non-unique
+	   keys.
+	*/
 
-	unlink (path);
+	/* unlink (path); */
 
-	fprintf (stderr, "key for %s is 0x%x\n", path, key);
+	shmflags = mode;
 
-	shmflags = 0;
+	if (perm & O_CREAT) {
+		shmflags |= IPC_CREAT;
+	}
 
-//	if (mode & O_TRUNC) {
-//		shmflags |= IPC_CREAT;
-//	}
+	if (perm & O_TRUNC) {
+		shmflags |= IPC_EXCL;
+	}
 
 	if ((*shmid = shmget (key, size, shmflags)) < 0) {
-		jack_error ("cannot create shm segment %s (%s)", shm_name, strerror (errno));
-		return MAP_FAILED;
+
+		if (errno == EEXIST && (shmflags & IPC_EXCL)) {
+
+			shmflags &= ~IPC_EXCL;
+
+			if ((*shmid = shmget (key, size, shmflags)) < 0) {
+				jack_error ("cannot get existing shm segment for %s (%s)",
+					    shm_name, strerror (errno));
+				return MAP_FAILED;
+			}
+
+		} else {
+			jack_error ("cannot create shm segment %s (%s)", shm_name, strerror (errno));
+			return MAP_FAILED;
+		}
 	}
 
-	if ((addr = shmat (*shmid, 0, 0)) != 0) {
+	if ((addr = shmat (*shmid, 0, 0)) < 0) {
 		jack_error ("cannot attach shm segment %s (%s)", shm_name, strerror (errno));
 		return MAP_FAILED;
 	}