--- ray/src/hd/rhdisp.c	1998/08/26 13:06:09	3.32
+++ ray/src/hd/rhdisp.c	1998/11/11 16:58:51	3.35
@@ -109,7 +109,7 @@ char	*argv[];
 			if (inp & DFL(DC_QUIT))
 				serv_request(DR_SHUTDOWN, 0, NULL);
 		}
-		if (rdy & RDY_SIN)		/* user input from sstdin */
+		if (rdy & RDY_SIN && !imm_mode)	/* user input from sstdin */
 			switch (usr_input()) {
 			case DC_PAUSE:
 				pause = 1;
@@ -289,8 +289,9 @@ again:
 			}
 			copystruct(v, viewhist + ((nhist-1)%VIEWHISTLEN));
 			goto again;
-		}
-	beam_sync(0);		/* update server */
+		}	
+				/* update server */
+	imm_mode = beam_sync(0) > 0;
 				/* record new view */
 	if (v < viewhist || v >= viewhist+VIEWHISTLEN) {
 		copystruct(viewhist + (nhist%VIEWHISTLEN), v);
@@ -421,14 +422,15 @@ serv_result()			/* get next server result and process 
 	case DS_STARTIMM:
 	case DS_ENDIMM:
 #ifdef DEBUG
-		if (imm_mode != (msg.type==DS_STARTIMM)) {
+		{
 			time_t	tnow = time(NULL);
-			if (imm_mode) timm += tnow - tmodesw;
-			else tadd += tnow - tmodesw;
+			if (msg.type==DS_STARTIMM) tadd += tnow - tmodesw;
+			else timm += tnow - tmodesw;
 			tmodesw = tnow;
 		}
 #endif
-		imm_mode = msg.type==DS_STARTIMM;
+		if (!(imm_mode = msg.type==DS_STARTIMM))
+			dev_flush();
 		goto noargs;
 	case DS_ACKNOW:
 	case DS_SHUTDOWN:
@@ -457,6 +459,11 @@ char	*p;
 {
 	MSGHEAD	msg;
 	int	m;
+				/* consistency checks */
+#ifdef DEBUG
+	if (nbytes < 0 || nbytes > 0 & p == NULL)
+		error(CONSISTENCY, "bad buffer handed to serv_request");
+#endif
 				/* get server's attention for big request */
 	if (nbytes >= BIGREQSIZ-sizeof(MSGHEAD)) {
 		serv_request(DR_ATTEN, 0, NULL);