--- uae/src/disk.c	2018/04/24 17:03:40	1.1.1.13
+++ uae/src/disk.c	2018/04/24 17:07:10	1.1.1.15
@@ -731,10 +731,12 @@ void DISK_check_change (void)
 
     for (i = 0; i < 4; i++) {
 	drive *drv = floppy + i;
+	gui_lock ();
 	if (strcmp (currprefs.df[i], changed_prefs.df[i])) {
 	    strcpy (currprefs.df[i], changed_prefs.df[i]);
 	    disk_insert (i, currprefs.df[i]);
 	}
+	gui_unlock ();
 	/* emulate drive motor turn on time */
 	if (drv->dskready_time) {
 	    drv->dskready_time--;
@@ -864,7 +866,7 @@ static uae_u32 dskpt;
 static void disk_dmafinished (void)
 {
     INTREQ (0x8002);
-    dskdmaen = 1; /* surprise, it isn't set to zero! */
+    dskdmaen = 0; /* ??? */
 #ifdef DISK_DEBUG
     write_log("disk dma finished %08.8X\n", dskpt);
 #endif