Have been thinking about the reaction of most of us on the lack...

Have been thinking about the reaction of most of us on the lack of information from the Roo, and have revisited the quarterly activities report, and they do actually mention the low water levels:

In addition, Kangaroo commenced the initial delivery of 50,000 tonnes of semi-soft coking coal from Mamahak down the Mahakam River to realise the first coal sales from the Project.
This initial sale is a priority for the Company as it will realise approximately US$5 million in revenue and provide a significant boost to working capital for all of the Companys projects in Indonesia.
The ramp-up of production at Mamahak has been affected by these key production and logistical issues, resulting in some delays in operational delivery.
In particular, unnaturally low water levels in the upper reaches of the Mahakam River has slowed the barging of coal to ships, underlining the importance of ultimately building strong systems and controls to ensure that each aspect of the operational chain flows smoothly as the Project progresses.

So, it was out there, but for obvious reasons they are not going to make a huge deal about it. As Nannook has stated, the Roo must have informed the consortium and if they are aware of the delay and are still on board, that is the most important thing!