diff --git a/flixel/input/mouse/FlxMouse.hx b/flixel/input/mouse/FlxMouse.hx
index 95ce218c7e..4c28b85d74 100644
--- a/flixel/input/mouse/FlxMouse.hx
+++ b/flixel/input/mouse/FlxMouse.hx
@@ -13,11 +13,12 @@ import flash.Lib;
 import flash.ui.Mouse;
 import flash.Vector;
 import flixel.FlxG;
+import flixel.input.FlxInput.FlxInputState;
 import flixel.input.IFlxInputManager;
+import flixel.input.mouse.FlxMouseButton;
 import flixel.system.FlxAssets;
 import flixel.system.replay.MouseRecord;
 import flixel.util.FlxDestroyUtil;
-import flixel.input.mouse.FlxMouseButton.FlxMouseButtonID;
 #if FLX_NATIVE_CURSOR
 import flash.ui.MouseCursor;
 import flash.ui.MouseCursorData;
diff --git a/flixel/system/replay/FlxReplay.hx b/flixel/system/replay/FlxReplay.hx
index 8e36cfe2c3..a98a2f21d2 100644
--- a/flixel/system/replay/FlxReplay.hx
+++ b/flixel/system/replay/FlxReplay.hx
@@ -149,12 +149,12 @@ class FlxReplay
 		
 		#if FLX_KEYBOARD
 		var keysRecord:Array<CodeValuePair> = FlxG.keys.record();
-		if (keysRecord == null) continueFrame = false;
+		if (keysRecord != null) continueFrame = false;
 		#end
 		
 		#if FLX_MOUSE
 		var mouseRecord:MouseRecord = FlxG.mouse.record();
-		if (mouseRecord == null) continueFrame = false;
+		if (mouseRecord != null) continueFrame = false;
 		#end
 
 		if (continueFrame)
diff --git a/tests/unit/src/flixel/system/replay/FlxReplayTest.hx b/tests/unit/src/flixel/system/replay/FlxReplayTest.hx
new file mode 100644
index 0000000000..dc0191feb4
--- /dev/null
+++ b/tests/unit/src/flixel/system/replay/FlxReplayTest.hx
@@ -0,0 +1,74 @@
+package flixel.system.replay;
+
+import flixel.input.keyboard.FlxKey;
+import massive.munit.Assert;
+
+class FlxReplayTest extends FlxTest
+{
+	var seed:Int;
+	var fgr:String;
+	var frameCount:Int;
+
+	@Before
+	function before()
+	{
+		seed = 123456789;
+		frameCount = 300;
+		fgr = seed + "\n";
+		var key:Int;
+		var x:Int;
+		var y:Int;
+		var possibleKeys:Array<Int> = [for (key in FlxKey.toStringMap.keys()) key];
+		for (key in [-1, -2, 192, 220]) // exclude not-really-keys, and debugger activators (so as not to affect other tests by having the debugger open)
+			possibleKeys.remove(key);
+		for (i in 0...frameCount)
+		{
+			key = possibleKeys[i % possibleKeys.length];
+			x = i % FlxG.width;
+			y = FlxG.height - (i % FlxG.height);
+			fgr += i + "k" + key + ":1m" + x + "," + y + ",2,0\n"; // each frame has a simultaneous key-already-down and mouse-just-down
+		}
+		fgr += (frameCount++) + "km0,0,2,0\n"; // put everything back how it was for the next test
+	}
+	
+	@Test
+	function testReplayCreateSpecifyingSeed()
+	{
+		var replay = new FlxReplay();
+		replay.create(seed);
+		Assert.areEqual(seed, replay.seed);
+	}
+
+	@Test
+	function testReplayLoadSeed()
+	{
+		var replay = new FlxReplay();
+		replay.load(fgr);
+		Assert.areEqual(seed, replay.seed);
+	}
+
+	@Test
+	function testReplayLoadFrameCount()
+	{
+		var replay = new FlxReplay();
+		replay.load(fgr);
+		Assert.areEqual(frameCount, replay.frameCount);
+	}
+	
+	@Test // #1739
+	function testReplayRecordSimultaneousKeydownAndMouseDown()
+	{
+		var replayPlayer = new FlxReplay();
+		var replayRecorder = new FlxReplay();
+		replayRecorder.create(seed);
+		replayPlayer.load(fgr);
+		while (!replayPlayer.finished)
+		{
+			replayPlayer.playNextFrame();
+			replayRecorder.recordFrame();
+			step();
+		}
+		var resavedFGR:String = replayRecorder.save();
+		Assert.areEqual(fgr, resavedFGR);
+	}
+}
\ No newline at end of file