Cubase 7.0.2 Cursor

Cursor flashes when I zooming into the arrange view and the midi editor.
Halion 4 vu meter lag(when the mixer page is selected) the cursor in the arrange vu and the vu meter in the mixconsole lag strongly and are unusable when they’re all open.
White flashes/blank window for less 1 second when i opening Halion 4 and/or the Edit channel
lag when i opening the mixconsole with F3.(I’m pretty much happy with Cubase and it’s my main DAW.)

Win7 64 Sp1/Cubase 7.0.2 _64/ Halion 4.5.4 _64
cpu: amd phenom II x6 1090T @ 3.20ghz
gpu: gtx 560ti 1g ram/ Nvidia
ram: 8g (4x2)
psu:850w 80+
Reason 6.5-Recycle 2.2/FL Studio 9/Pro tools 8