I agree with SS. I believe (Subject to verification from oDesk) a job is placed on "hold" by oDesk if a problem problem exists. For example, the client's method of payment has failed. In addition, a client can "pause" a contract as denoted by "This contract has been paused by the client."
In this particular case, I suggest contacting oDesk Support by going to the oDesk Help Center https://support.odesk.com/
Edited 01/09/2015 RT/lwm