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Found the solution. I somehow skipped over this line
"Find the <pages> tag and set the attributes controlRenderingCompatibilityVersion="3.5" and clientIDMode=”AutoID”."
on the article http://world.episerver.com/Articles/Items/EPiServer-CMS-60-now-supporting-ASPNET-40/
I have installed Composer 4 on a site and I'm using Page Type Builder. The site is running .net 4 so I have followed the instructions for Composer 4 here: http://world.episerver.com/Articles/Items/EPiServer-Community-4-Composer-4-and-Mail-5-now-supporting-ASPNET-40/
In composer edit on page the toolbox does not display and I get the following javascript errors:
Message: 'null' is null or not an object
Line: 5
Char: 74101
Code: 0
URI: http://dca/ScriptResource.axd?d=FMgHjNEEwpocvorU4jpiH-GUUZ6DbiftGay0ccOO4EPX1WZdXyytmNVgk-RlxBKLYz6cPAxNjh2WqgGpQM2WlHVSLRL9rT9fCvLIlA-upMw5u3c-WJrW1cMRVCwrC88in81ZgAaP8jc4UluiG8Z6e0uOdby7wagljPB0nrkRJqs1&t=2610f696
Message: 'RenderOverWindowedObjects' is null or not an object
Line: 1
Char: 408
Code: 0
URI: http://dca/ScriptResource.axd?d=AmvDXu2LTIuwmK-WZ9smpi-RoBB5tuYxpU00-TBe-NkDxDxR74c7qfyy7CXpvvZlt67iXsga6oumnlJzwPORmgRg_pUTYpipfjA554vUgEUwGLdWRGzYP5IHlk42JOpRc0Yaj8gVYZuH8xJSWqLZ5P9TOm79iMml7gf3gHuMutoePkOGkAprcAvSQXgrn5yl0&t=e1f6fd9
Any ideas would be appreciated.