How do I use an external diff tool to compare *folders* in Intellij IDEA?

Question

I am attempting to use an external diff tool (Beyond Compare) to compare folders in Intellij IDEA 13 (EAP Build #IU-133.471).

Settings

My Intellij IDEA settings are as follows:

Documentation

Relevant documentation for BC : here and here

Intellij IDEA's doc on the subject : here

Herein Lies the Rub

And here is what happens when I select two directories and press Ctrl + D (the shortcut to Compare Directories) :

The same works fine when comparing files:

I have attempted using the current stable version of both Beyond Compare (v3.0) as well as Intellij to no avail. I have had no joy after appending the parameters %1 %2 etc. to the Path to Executable either.

Can you think of what I might be missing ? Have you used an external diff tool to compare folders in Intellij IDEA ?

Am planning to ask this question in the Intellij forums and/or raise a Support Ticket with them after waiting to hear back from the SO community.

Thanks!

Update

Question now present in the Intellij IDEA forums too : http://devnet.jetbrains.com/message/5506980

Answer 1

This seems to be a bug in Intellij.

See this.

Update (9-Nov-2015)

I am using Intellij Idea v 14.1.5 and can confirm that this bug has been fixed.

Answer 2

I really like the IntelliJ plugin "Compare Directories" I have used it since IntelliJ 13.

Here's the plugin's home page: http://plugins.jetbrains.com/plugin/?idea&id=113

Once installed, the tool can be used by right clicking a directory or package and then setting the directory structure to compare against. This tool includes directory and file level comparisons.