Ann: Annual Report to shareholders, page-23

There are definitely concerns with the report, especially around costs, but I don't see there being major issues with the doubtful debt provision. They've already received $1,881,000 after the year end and with it being a major Australian customer (presumably Telstra, or possibly Optus), I'm not too worried about it getting paid, although it is obviously frustrating and a little concerning that they are having these issues with a major customer.
I'll be watching the next couple quarterlies to see costs stabilize and receipts grow before buying anymore but I still think the business is solid. And hopefully with the company's new policies and processes for customer payment terms can reduce issues going forward.