Resolution and Toolbar on Guest after Update to 5.1.14

[Kuno]

Hello,

after Update from VB 5.0.x to 5.1.14 on KUbuntu 16.04, the Resolution in my Win7-Guest is limited to 1440 Pixel (previously 1920 Pixel).
The second new Problem is, that the VB-Toolbar in the Guestsystems does'nt work (can't click on any Button).
This Problem is also into my other Guest-Installation i. e. KUbuntu 14.04.

I've installed also Extension Pack 5.1.14.

Any Idea to fix this Problems?
Thanks.

Regards,
Kuno

[socratis]

You updated VirtualBox, you updated the ExtPack, but did you update the Guest Additions (GAs) in your VMs? If you know you did, with the VM shut down completely (not paused or saved), right-click on the VirtualBox Manager and select "Show Log". Save the "VBox.log" (just the first one), ZIP it and attach it in your response (see the "Upload attachment" tab below the reply form).