Things can go wrong at progzoo.net You may be able to fix them
Corruption at the server
This is mostly caused by a queue getting corrupted. Progzoo queues all requests so that there are only a limited number of jobs running at any one time. The queue is stored in JSON format - it has happened that the file gets corrupted. In that case you can trash the queue. This means that all waiting jobs will be lost (but when the queu is corrupt they'll never get done anyhow).
You can see the queue by visiting http://progzoo.net/r.cgi?lang=java Change lang to one of
java cs cpp pl php py rb vb
You can trash the queue by visiting http://progzoo.net/r.cgi?lang=java&trashTheQueue=0 - but change the 0 to 1.