Version 2.0.6 of A2Billing has now been released, and includes a number of bug fixes.
We would remind anyone still using a version of A2Billing earlier than version 2.x, e.g. 1.9.4, that they should plan to upgrade as a matter of urgency for both security and for compatibility with Paypal.
We offer a range of installation, upgrade, training and support options for A2Billing and its other products, see http://www.star2billing.com/products/ and http://www.asterisk2billing.org/pricing/ for more details.
The Star2Billing Team.