When filling a Digital Signature field from a mobile app, signature does not show Reader or Acrobat

Question

Scenario :
1. Receiving a pdf form with digital siganture field.
2. Signing form using various pdf apps. " PDF EXPERT for iPad/iPhone"
3. After signing and emailing the document, opening in reader or Acrobat, the signature does not display but the field is gone, as if it was signed.
* Is reader /acrobat requiring a validation that it is not receiving to show the signature?
Did verify that the signature shows in Chrome, using chromes default pdf viewer.

Answer 1

New Feature came in the last update.
Here is the reference material to disable it:
Signing with EchoSign
These preferences allow IT to remove signing options from the product's user interface.
http://www.adobe.com/devnet-docs/acrobatetk/tools/PrefRef/Windows/FeatureLockdown.html?zoo m_highlight=echosign#idkeyname_1_6294
Summary table
bEnableEchoSignDetection
Displays the Document Message Bar when a blank signature field is detected.
bEnableFillSig
Specifies whether to remove the Sign Now panel from the Sign Pane.
bEnableSignPane
Specifies whether to remove the Sign task pane button from the toolbar.
bEnableEchoSignDetection 
Top>FeatureLockdown>Signing with EchoSign>bEnableEchoSignDetection
Data type
boolean: DWORD value > REG_DWORD
Default
1
Version #
11.0.03
Lock Path
HKLM\SOFTWARE\Policies\Adobe\(product name)\(version)\FeatureLockdown\cServices
Summary
Displays the Document Message Bar when a blank signature field is detected.
Details
When enabled, the product tries to detect if a document may need to be signed. If the words "Sign" or "Signature" are detected next to any line, a document message bar appears with an "Open Sign Pane" button. Possible values include:
0: Don't detect signature fields.
1: Do detect signature fields.