I am experiencing the same problem.
I am running Kubuntu 11.04 Beta1 on an Asus P8H67-M PRO/CSM motherboard with a Sandy Bridge Intel i7-2600K CPU using the on CPU Intel HD Graphics.
Also of note is that menus in non-KDE applications do display correctly (e.g., Firefox, Open Office, etc.)
I am experiencing the same problem.
I am running Kubuntu 11.04 Beta1 on an Asus P8H67-M PRO/CSM motherboard with a Sandy Bridge Intel i7-2600K CPU using the on CPU Intel HD Graphics.
Also of note is that menus in non-KDE applications do display correctly (e.g., Firefox, Open Office, etc.)