I am not sure the SarkPBX wiki guide is complete.
In manager.conf I also had to set bindaddr=0.0.0.0 in [general]
In the ada custom app I had to set include=>internal (not default)
I have also seen that the custom app must be [ada] in lowercase and not [ADA] in uppercase. The Digium admin guide is wrong apparently, although I haven't tested.
The ADA installer also installs an addon for firefox, but the maximum version number supported is 3.5. If you use a version later than this then you must edit C:\Program Files\Digium\ADA\Mozilla\install.rdf
There is a tag starting with <em:maxVersion>, and the version number is 3.5
Replace the version number with 3.5.7 (or possibly higher but I can only confirm it works with firefox up to 3.5.7)
You need to make this change immediately after installing ADA and
before starting firefox.
This is all with latest ADA version 1.1 available here
http://dl1.digium.com/ADA1.1/ADAInstall.exe, Sail-2.4.1-6 and Asterisk14-1.4.28-88