I had a problem with listing of available renderings inside selected placeholder. Issue occurs when display name should be used inside list of renderings in experience editor.
In placeholder settings we could saw wrong names (item names when we should saw display names) :
It is a list of controls inside content editor – names are correct.
It is a name of controls inside experience editor – names are incorrect.
If you want to fix it you have to use patch prepared by Sitecore support team for Sitecore version 8.1 rev. 151003 (Initial Release):
1) Copy the Sitecore.Support.88236.dll into /bin folder;
2) Copy Sitecore.Support.88236.config into /App_Config/Include folder.
You can download these files here: click.