Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.71
Broken: version: 2.80 (sub 58), branch: blender2.7, commit date: 2019-04-24 02:30, hash: rB1b839e85e142
Short description of error
Clicking the fly-out widget to open the Info (N) panel does not open the panel when you start up Blender. However if you press (N) to open the panel, then (N) again to close it, you will be able to click the widget and open/close the panel.
Exact steps for others to reproduce the error
Kill your configs by deleting the 2.8 folder in users/appdata/roaming/blender
Click on the flyout widget to try and open the Info (N) panel. Nothing will happen. Click around to hunt for the hot spot. Nothing will happen.
Press (N). The Info panel will open.
Press (N) again. The info panel will close.
Now click on the flyout widget to open the Info panel. It will work just fine.