Index: src/OFDataArray.m
==================================================================
--- src/OFDataArray.m
+++ src/OFDataArray.m
@@ -156,11 +156,11 @@
 {
 	if (nitems > count)
 		@throw [OFOutOfRangeException newWithClass: isa];
 
 	memmove(data + index * itemsize, data + (index + nitems) * itemsize,
-	    nitems * itemsize);
+	    (count - index - nitems) * itemsize);
 
 	count -= nitems;
 	@try {
 		data = [self resizeMemory: data
 				 toNItems: count
@@ -322,11 +322,11 @@
 
 	if (nitems > count)
 		@throw [OFOutOfRangeException newWithClass: isa];
 
 	memmove(data + index * itemsize, data + (index + nitems) * itemsize,
-	    nitems * itemsize);
+	    (count - index - nitems) * itemsize);
 
 	count -= nitems;
 	nsize = (count * itemsize + lastpagebyte) & ~lastpagebyte;
 
 	if (size != nsize)

Index: src/OFMutableArray.m
==================================================================
--- src/OFMutableArray.m
+++ src/OFMutableArray.m
@@ -48,10 +48,11 @@
 
 	for (i = 0; i < count; i++) {
 		if ([objs[i] isEqual: obj]) {
 			[objs[i] release];
 			[array removeItemAtIndex: i];
+			return self;
 		}
 	}
 
 	return self;
 }