使用SharePoint Disigner 2013 打开SharePoint online 时出现需要重启的问题。

“服务器端活动已更新。要使用活动的更新版本，您需要重新启动SharePoint设计器”

"Server-side activities have been updated. You need to restart SharePoint Designer to use the updated version of activities."

解决办法：

　　1、必须安装SharePoint Designer SP1更新；

　　2、安装SharePoint Designer 3114337更新；

　　清理缓存：　　　　

1. %APPDATA%\Microsoft\Web Server Extensions\Cache

2. %APPDATA%\Microsoft\SharePoint Designer\ProxyAssemblyCache

3. %USERPROFILE%\AppData\Local\Microsoft\WebsiteCache

4. %APPDATA%\Microsoft\SharePoint Designer

　　

　　再启动SharePoint Designer.