I changed my preferences to 'use only 50% of CPU', and since then have I have had 'no work available to process', even though I have restored preferences to defaults.

I was part way through two HadSM3 models one global one and one for Europe, although can't remember the specific names as they've now disappeared from BOINC manager. Running snow leopard on a macbook. Any ideas why this is happening?

Thu May 26 20:19:45 2011 Starting BOINC client version 6.10.58 for x86_64-apple-darwin
Thu May 26 20:19:45 2011 log flags: file_xfer, sched_ops, task
Thu May 26 20:19:45 2011 Libraries: libcurl/7.19.7 OpenSSL/0.9.7l zlib/1.2.3 c-ares/1.6.0
Thu May 26 20:19:45 2011 Data directory: /Library/Application Support/BOINC Data
Thu May 26 20:19:46 2011 Processor: 2 GenuineIntel Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz [x86 Family 6 Model 15 Stepping 6]
Thu May 26 20:19:46 2011 Processor features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT PSE36 CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM SSE3 MON DSCPL VMX EST TM2 SSSE3 CX16 TPR PDCM
Thu May 26 20:19:46 2011 OS: Mac OS X 10.6.7 (Darwin 10.7.0)
Thu May 26 20:19:46 2011 Memory: 2.00 GB physical, 224.48 GB virtual
Thu May 26 20:19:46 2011 Disk: 297.77 GB total, 224.24 GB free
Thu May 26 20:19:46 2011 Local time is UTC +1 hours
Thu May 26 20:19:46 2011 No usable GPUs found
Thu May 26 20:19:46 2011 climateprediction.net URL http://climateprediction.net/; Computer ID 1149450; resource share 100
Thu May 26 20:19:46 2011 No general preferences found - using BOINC defaults
Thu May 26 20:19:46 2011 Preferences:
Thu May 26 20:19:46 2011 max memory usage when active: 1024.00MB
Thu May 26 20:19:46 2011 max memory usage when idle: 1843.20MB
Thu May 26 20:19:46 2011 max disk usage: 10.00GB
Thu May 26 20:19:46 2011 don't use GPU while active
Thu May 26 20:19:46 2011 suspend work if non-BOINC CPU load exceeds 25 %
Thu May 26 20:19:46 2011 (to change preferences, visit the web site of an attached project, or select Preferences in the Manager)
Thu May 26 20:19:46 2011 Not using a proxy
Thu May 26 20:21:48 2011 No general preferences found - using BOINC defaults
Thu May 26 20:21:48 2011 Preferences:
Thu May 26 20:21:48 2011 max memory usage when active: 1024.00MB
Thu May 26 20:21:48 2011 max memory usage when idle: 1843.20MB
Thu May 26 20:21:48 2011 max disk usage: 10.00GB
Thu May 26 20:21:48 2011 don't use GPU while active
Thu May 26 20:21:48 2011 suspend work if non-BOINC CPU load exceeds 25 %
Thu May 26 20:21:48 2011 (to change preferences, visit the web site of an attached project, or select Preferences in the Manager)
Thu May 26 20:33:13 2011 Suspending computation - user request
Thu May 26 20:33:14 2011 Resuming computation
Thu May 26 20:35:02 2011 climateprediction.net update requested by user
Thu May 26 20:35:03 2011 climateprediction.net Sending scheduler request: Requested by user.
Thu May 26 20:35:03 2011 climateprediction.net Requesting new tasks
Thu May 26 20:35:04 2011 climateprediction.net Scheduler request completed: got 0 new tasks
Thu May 26 20:35:04 2011 climateprediction.net Message from server: (Project has no jobs available)

The project is out of work, as per the News and Announcements thread, and several user threads in Windows, Getting started, and Number crunching.

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Backups: Here

Cheers - I am confused as I assumed that once a model had started running it would continue without needed to download any more files. But if this is not the case I will wait for for work to download.

The 2 models that you had earlier have both crashed. See the Tasks page here, and the individual pages for the models.
On the model pages, click the + button alongside Stderr to see the error list.

There are a large number of Suspend request from BOINC messages, which usually indicates that you're left the Suspend work if CPU usage is above
0 means no restriction
Enforced by version 6.10.30+
option to the default of 25%. This will mean that BOINC, and the models, stop and start a lot as your personal use of the computer increases.

This is the same as turning off the computer without first stopping the BOINC core client, (and hence the models). Doing this will sooner or later crash the models, as the stored state of the many files gets out of sync., preventing the models from re-starting.

If you set the option above to zero, it will be turned off, allowing BOINC to run smoother.

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Backups: Here

And in case you haven't read through the science pages linked from the project's front page, climate models don't automatically run from start to finish.

They run for as long as the starting parameters allow without becoming unstable. If they become unstable before reaching their end point, they fail, which allows the researchers to see what the end result is for that given set of parameters.

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Backups: Here