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：
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%APPDATA%\Microsoft\Web Server Extensions\Cache
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%APPDATA%\Microsoft\SharePoint Designer\ProxyAssemblyCache
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%USERPROFILE%\AppData\Local\Microsoft\WebsiteCache
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%APPDATA%\Microsoft\SharePoint Designer
再启动SharePoint Designer.