Visual Studio 2010 and older
Symbols may appear in the wrong background color after changing the Windows background color. To fix this, go to:
IDE | Tools | Options | Environment | Fonts and Colors
and change the background color for Identifiers from "Default" to "Automatic"
![](/~/media/wholetomato/kb/symbols-have-the-wrong-background-color/identifier_color_code.ashx?la=ja&hash=15632D3334E39AE0E504B540A99E1790B7B32FC3)
![](/~/media/wholetomato/kb/symbols-have-the-wrong-background-color/identifier_color_options.ashx?la=ja&hash=F5DE6FA713DCAD7565A3F499797EC889610BE88A)