There seems to be an error when switching to Editable Grid:
Microsoft Dynamics 365 Error Report Contents
<CrmScriptErrorReport>
<ReportVersion>1.0</ReportVersion>
<ScriptErrorDetails>
<Message>Unable to get property 'length' of undefined or null reference</Message>
<Line>2</Line>
<URL></URL>
<PageURL>/main.aspx#311932832</PageURL>
<Function>anonymousr:Unabletogetproperty'length'ofundefinedornullreference</Function>
<FunctionRaw>TypeError: Unable to get property 'length' of undefined or null reference</FunctionRaw>
<CallStack>
<Function>anonymousr:Unabletogetproperty'length'ofundefinedornullreference</Function>
</CallStack>
</ScriptErrorDetails>
<ClientInformation>
<BrowserUserAgent>Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3; rv:11.0) like Gecko</BrowserUserAgent>
<BrowserLanguage>en-US</BrowserLanguage>
<SystemLanguage>en-US</SystemLanguage>
<UserLanguage>nl-BE</UserLanguage>
<ScreenResolution>1680x1050</ScreenResolution>
<ClientName>Web</ClientName>
<ClienState>Online</ClienState>
<ClientTime>2017-07-19T13:47:43</ClientTime>
</ClientInformation>
<ServerInformation>
<OrgLanguage>1033</OrgLanguage>
<OrgCulture>2067</OrgCulture>
<UserLanguage>1033</UserLanguage>
<UserCulture>1033</UserCulture>
<OrgID>{xxxxxxxxxxxxxxxxx}</OrgID>
<UserID>{xxxxxxxxxxxxxxxxx}</UserID>
<CRMVersion>8.2.1.202</CRMVersion>
</ServerInformation>
</CrmScriptErrorReport>