I troubleshooted a piece of CSOM code in SharePoint 2013. I got the following error:

Method “GetList” does not exist

The reason was that the method GetList was not imlemented until March 2015 CU (15.0.4701.1001), and the SharePoint farm I had was SharePoint 2013 SP1 (15.0.4569.1000). So the solution is to install the Cumulative Update or use web.Lists.GetByTitle. GetByTitle has one aweful shortcoming: it doesn’t work in multilingual environments. So I have recommended to install the March 2015 CU.

In our Intranet we got this nasty double encoding error that was introduced in SharePoint April 2014 CU. In July 2014 CU the problem is still there. I often hear the suggestions to update files directly in the hive (the root folder for SharePoint: C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\) In that blog post it is described what the problem is and what files are affected and what code must be altered in order to get it to work (which I like). But it is also suggested to update the Search.ClientControls.js directly on the server (which I don’t like). So my advise is: