Source: Flyouts might not open when clicking icons on the taskbar in Build 10130 of Windows 10 Insider Preview
When you click icons on the taskbar (including Start, Cortana, Network, Battery, and Action Center) in Build 10130 of Windows 10 Insider Preview, the expected flyout might not open.
An update is available to resolve this problem.
How to obtain this update
This update is available from Windows Update
To apply this update, you must be running Windows 10 Insider Preview Build 10130.
You must restart the computer after you apply this update.
Update replacement information
This update does not replace any previously released update.
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). Be aware that dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time bias. The dates and times may also change when you perform certain operations on the files.