diff --git a/dtool/src/dtoolutil/pfstreamBuf.cxx b/dtool/src/dtoolutil/pfstreamBuf.cxx
index f746ca5ac9..a9a2abd12a 100644
--- a/dtool/src/dtoolutil/pfstreamBuf.cxx
+++ b/dtool/src/dtoolutil/pfstreamBuf.cxx
@@ -185,7 +185,7 @@ is_open() const {
  */
 bool PipeStreamBuf::
 eof_pipe() const {
-  return (_pipe == nullptr) && feof(_pipe);
+  return (_pipe == nullptr) || feof(_pipe);
 }
 
 /**
diff --git a/panda/src/cocoadisplay/cocoaGraphicsWindow.mm b/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
index 3aae8aee63..bfa35b41df 100644
--- a/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
+++ b/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
@@ -728,13 +728,12 @@ set_properties_now(WindowProperties &properties) {
       // here.
       if (!properties.has_undecorated() && !_properties.get_undecorated() &&
           [_window respondsToSelector:@selector(setStyleMask:)]) {
-        if (properties.get_fixed_size()) {
-          [_window setStyleMask:NSTitledWindowMask | NSClosableWindowMask |
-                                NSMiniaturizableWindowMask ];
-        } else {
-          [_window setStyleMask:NSTitledWindowMask | NSClosableWindowMask |
-                                NSMiniaturizableWindowMask | NSResizableWindowMask ];
+        NSUInteger style = ([_window styleMask] & NSFullScreenWindowMask);
+        style |= NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask;
+        if (!properties.get_fixed_size()) {
+          style |= NSResizableWindowMask;
         }
+        [_window setStyleMask:style];
         [_window makeFirstResponder:_view];
         // Resize event fired by makeFirstResponder has an invalid backing scale factor
         // The actual size must be reset afterward
@@ -749,16 +748,14 @@ set_properties_now(WindowProperties &properties) {
     _properties.set_undecorated(properties.get_undecorated());
 
     if (!_properties.get_fullscreen()) {
-      if (properties.get_undecorated()) {
-        [_window setStyleMask: NSBorderlessWindowMask];
-      } else if (_properties.get_fixed_size()) {
-        // Fixed size windows should not show the resize button.
-        [_window setStyleMask: NSTitledWindowMask | NSClosableWindowMask |
-                               NSMiniaturizableWindowMask ];
-      } else {
-        [_window setStyleMask: NSTitledWindowMask | NSClosableWindowMask |
-                               NSMiniaturizableWindowMask | NSResizableWindowMask ];
+      NSUInteger style = ([_window styleMask] & NSFullScreenWindowMask);
+      if (!properties.get_undecorated()) {
+        style |= NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask;
+        if (!properties.get_fixed_size()) {
+          style |= NSResizableWindowMask;
+        }
       }
+      [_window setStyleMask:style];
       [_window makeFirstResponder:_view];
       // Resize event fired by makeFirstResponder has an invalid backing scale factor
       // The actual size must be reset afterward
@@ -1176,10 +1173,16 @@ do_switch_fullscreen(CGDisplayModeRef mode) {
     }
 
     if (_window != nil) {
+      // Exit macOS' own fullscreen mode, since our own fullscreen mode
+      // doesn't work properly with it.
+      if ([_window styleMask] & NSFullScreenWindowMask) {
+        [_window toggleFullScreen:nil];
+      }
+
       // For some reason, setting the style mask makes it give up its
       // first-responder status.
       if ([_window respondsToSelector:@selector(setStyleMask:)]) {
-        [_window setStyleMask:NSBorderlessWindowMask];
+        [_window setStyleMask:([_window styleMask] & NSFullScreenWindowMask)];
       }
       [_window makeFirstResponder:_view];
       [_window setLevel:CGShieldingWindowLevel()];
diff --git a/panda/src/cocoadisplay/cocoaPandaApp.mm b/panda/src/cocoadisplay/cocoaPandaApp.mm
index 83f0b8ef42..d256102a2c 100644
--- a/panda/src/cocoadisplay/cocoaPandaApp.mm
+++ b/panda/src/cocoadisplay/cocoaPandaApp.mm
@@ -16,11 +16,11 @@
 
 @implementation CocoaPandaApp
 - (void) sendEvent: (NSEvent *) event {
-  // This is a hack that allows us to receive cmd-key-up events correctly.
-  // Also prevent it from eating the inserthelp key.
-  if (([event type] == NSKeyUp && ([event modifierFlags] & NSCommandKeyMask))
-    ||([event type] == NSKeyDown && [event keyCode] == 0x72)) {
-
+  // This is a hack that allows us to receive cmd-key-up events correctly, as
+  // well as key-up events during a full-screen transition.
+  // Also prevent it from eating the insert/help key.
+  if ([event type] == NSKeyUp ||
+      ([event type] == NSKeyDown && [event keyCode] == 0x72)) {
     [[self keyWindow] sendEvent: event];
   } else {
     [super sendEvent: event];
diff --git a/panda/src/distort/projectionScreen.cxx b/panda/src/distort/projectionScreen.cxx
index 63120ea290..ff77e4448c 100644
--- a/panda/src/distort/projectionScreen.cxx
+++ b/panda/src/distort/projectionScreen.cxx
@@ -451,9 +451,11 @@ recompute_geom_node(const WorkingNodePath &np, LMatrix4 &rel_mat,
   int num_geoms = node->get_num_geoms();
   for (int i = 0; i < num_geoms; i++) {
     PT(Geom) geom = node->modify_geom(i);
-    distort_cat.debug()
-      << "  " << *node << " got geom " << geom
-      << ", cache_ref = " << geom->get_cache_ref_count() << "\n";
+    if (distort_cat.is_debug()) {
+      distort_cat.debug()
+        << "  " << *node << " got geom " << geom
+        << ", cache_ref = " << geom->get_cache_ref_count() << "\n";
+    }
     geom->test_ref_count_integrity();
     recompute_geom(geom, rel_mat);
   }
diff --git a/panda/src/linmath/lorientation_src.I b/panda/src/linmath/lorientation_src.I
index 8cc56aa235..684f71118c 100644
--- a/panda/src/linmath/lorientation_src.I
+++ b/panda/src/linmath/lorientation_src.I
@@ -70,7 +70,7 @@ FLOATNAME(LOrientation)(const FLOATNAME(LMatrix4) &m) {
  */
 INLINE_LINMATH FLOATNAME(LOrientation) FLOATNAME(LOrientation)::
 operator * (const FLOATNAME(LRotation) &other) const {
-  return multiply((FLOATNAME(LOrientation) &)other);
+  return multiply((const FLOATNAME(LOrientation) &)other);
 }
 
 /**
@@ -80,5 +80,5 @@ operator * (const FLOATNAME(LRotation) &other) const {
 INLINE_LINMATH FLOATNAME(LOrientation) FLOATNAME(LOrientation)::
 operator * (const FLOATNAME(LQuaternion) &other) const {
   nassert_raise("LOrientation * LQuaternion is undefined; use LOrientation * LRotation or LQuaternion * LQuaternion");
-  return multiply((FLOATNAME(LOrientation) &)other);
+  return multiply((const FLOATNAME(LOrientation) &)other);
 }