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Product Version = NetBeans IDE 8.2 (Build 201609300101) Operating System = Mac OS X version 10.12 running on x86_64 Java; VM; Vendor = 9-ea Runtime = Java HotSpot(TM) 64-Bit Server VM 9-ea+142 Reproducibility: Happens every time STEPS: * Click on the red speech balloon at the bottom of the screen, which says "2" and should normally show 2 notifications ACTUAL: A useless "Notifications" panel appears with, from left to right, search and filter buttons; then a large white button with title "left button"; then a blank grey panel. EXPECTED: A "Notifications" panel appears that shows the 2 notifications.
Created attachment 162693 [details] IDE log
Created attachment 162694 [details] Screenshot of defective Notifications panel
User error. :-) I had installed JDK 9-ea and NetBeans 8.2 in quick succession and didn't realize that the latter was using the former. When I change netbeans.conf to point to a JDK 8 installation it works fine.
Thanks for your update. Closing as invalid then.