If the window's transparent it also needs to be textured.

diff --git a/atom/browser/native_window_mac.mm b/atom/browser/native_window_mac.mm
index 8dd6bcb..2a5813c 100644 (file)
--- a/atom/browser/native_window_mac.mm
+++ b/atom/browser/native_window_mac.mm
@@ -315,7 +315,7 @@ NativeWindowMac::NativeWindowMac(content::WebContents* web_contents,
 
   NSUInteger styleMask = NSTitledWindowMask | NSClosableWindowMask |
                          NSMiniaturizableWindowMask | NSResizableWindowMask;
-  if (!useStandardWindow) {
+  if (!useStandardWindow || transparent_) {
     styleMask |= NSTexturedBackgroundWindowMask;
   }