Using SharePoint JSOM api i have encountered very strange exception. Call to clientContext.executeQueryAsync threw sometimes exception System.ServiceModel.ServiceActivationException and responded with status 500. In our case it was problem with available RAM on development server. Actually it was thrown when available memory was under 5%. Simple increase on memory resolved this problem (no iisreset needed).
On my journey from SharePoint 2007 to SharePoint 2013 occured very strange problem. The project which I was migrating was using ASP UpdatePanels in combination with GridViews. The problem was that, if i clicked on some postback control in UpdatePanel, sometimes it made full page reload and sometimes classic postback refresh. I’ve spent several hours … Read moreUpdatePanel postback full page reload