The Open GApps widget (icon) is gray

There are two possible causes to this issue:

You are using a virtual device with Android 4.4 or below

Open GApps is not compatible with Android 4.4 and below.
Please use a virtual device with a higher Android version than 4.4.

You have set Genymotion Desktop to use an old or incompatible version of ADB (SDK tools)

1. Make sure that your Android SDK tools are up to date.
2. If for some reasons you cannot upgrade your SDK tools, set Genymotion ADB to default adb (in-built adb), install the OpenGapps and then revert ADB to your previous custom version.
3. Please check our documentation regarding ADB here.