This seems to be an issue with the preferences after this update that causes the menu to appear blank even though you can pull down the FruitJuice menu. We are working on an update to address this.
Until that fix is available, the following steps should correct the issue:
1) Quit FruitJuice
2) Delete the following file:
(Your Home Directory) > Library > Containers > com.batteryProject.FruitJuiceMAS > Data > Library > Application Support > com.batteryProject.FruitJuice > FruitJuicePrefs.plist
3) Restart FruitJuice.