你好：
有可能是受其他软件的影响，比如有的人机器上安装了卡巴斯基杀毒软件就会出现这种情况：
Selecting controls in VS2010 Windows Forms
designer and TextBox menu flickering
也有可能是显卡的原因，显卡驱动有问题导致某些元素显示不正常，或者是VS的某些设置导致的，尝试重置VS的设置：
Tools->Import
and Export Settings->Reset all settings
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