The Anderton Fx Chains now seem to be located under 'Browser/Media'.  But even so, I can no longer drag any of them to an effects bin.  I get a greyed-out text that follows the cursor while dragging but the effect refuses to drop in the bin.

The Media section of the Browser allows you to search all of your files just like windows Explorer
You have to a access the fx chains by selecting the fx plugins tab at the top of the browser.

If you use the default plugin layout you'll see listed VST3, VST2, DX, fx Chains in that order.

But that's just my problem.  Underneath the 'PlugIns/Audio Fx tab' the folders you mention are present (VST3, VST2, DirectX and FX Chain) but...  there is nothing in the FX Chain folder.  Nothing.  The Anderton effects used to be in there but after I downloaded the Dorchester Update, they are gone. 

Is the Preferences > File > Folder Locations "FX Chain Presets" path correct?

Here's the path under shown in 'Preferences > File > Folder Locations'
 
C:\Users\Daniel\Application Data\Cakewalk\SONAR Platinum
 
It looks correct.

Are the FX chains in that path or in a folder below it?

Actually that path is not correct.  It does not exist. 
 
Below is the correct path and I have now changed it.  Now I can see the effects (after closing and reopening SONAR).  I thank you for your help on this but I'm still baffled as to why the path changed on me after the Dorchester upload.  My Anderton effects were visible before the upload so I assume the path used to be correct.
 
It's a mystery. But thanks again.
 
C:\Cakewalk Content\FX Chain Presets