Now that I have example_app working I want to see if I can control it better. The default example app keeps the clients busy with 100 scheduled jobs, but what I'm looking at using boinc for involves more of a single submit job or batch queue of jobs rather than an infinite job count. What I've done so far is disable the sample_work_generator so no more jobs are being automatically queued. Next I tried using create_work to generate a single work unit to see how that would work. I created a sample input file in the directory specified by dir_hier_path. On the client I see the new work unit but the download is failing with this message:
06-Aug-2012 09:45:15 [test] Started download of my_job
06-Aug-2012 09:45:16 [test] Finished download of my_job
06-Aug-2012 09:45:16 [test] MD5 check failed for my_job
06-Aug-2012 09:45:16 [test] expected d41d8cd98f00b204e9800998ecf8427e, got 34973cf5b48ae1482fa4947b810c8f9c
06-Aug-2012 09:45:16 [test] Checksum or signature error for my_job

How do I fix this?

Best ask server and application related questions on the BOINC Projects email list. Some project admins do walk these forums, but you'll be old and grey by the time they do.

The list requires registration. But when you then post to it, it'll drop into the email inbox of many co-project-admins, most of whom are willing to help out a buddy-admin.

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I guess I'm still learning BOINC, I figured this one out too. The problem was that I had created an extra directory level in the downloads directory. This meant that the md5 checksum was for the directory and not the file within it. Once I figured that out, I'm getting downloads and processes again. However, why would I be getting two jobs instead of just one?