SoftwareUpdateCheck Relaunches Continuously - Software Update

Question

My SoftwareUpdateCheck is out of control.
My MacBook is constantly checking for software updates, and it's sucking up the processor on my machine, and download resources of my network. And I can't get it to stop.
The "Check for updates" checkbox in my "Software Update" System Preference pane is currently unchecked, but it has a remarkable ability to re-check itself.
In my Activity Monitor, SoftwareUpdateCheck bounces up and down between single digit percentages of my CPU power, and 80% (sometimes higher).
When I check the network with an SNMP monitor, my MacBook is maxing out the download bandwidth every second or so, until I force quit the process (yes, my office mates hate me!).
My MacBook fan runs until I "Force Quit" the process. Then it relaunches in anywhere from a few seconds to a few minutes (even while the System Preference for automatic checking remains unchecked).
So what have I tried? I've deleted (repeatedly) the com.apple.SoftwareUpdate.plist file from both the main Library, and from my user Library (although that one doesn't seem to be re-occuring there recently), and restarted.
I've installed all available updates.
I can't get this to stop. Help!
Any ideas?

Answer 1

Here's a snip from my console log. Could launchd be involved here?
4/12/08 9:30:25 AM com.apple.launchd[62] ([0x0-0x3cbfcbc].SoftwareUpdateCheck[34405]) Exited with exit code: 148
4/12/08 9:30:31 AM com.apple.launchd[62] ([0x0-0x3cbccb9].SoftwareUpdateCheck[34398]) Exited with exit code: 102
4/12/08 9:30:35 AM SoftwareUpdateCheck[34412] Checking for updates
4/12/08 9:30:45 AM com.apple.launchd[62] ([0x0-0x3cc5cc2].SoftwareUpdateCheck[34419]) Exited with exit code: 148
4/12/08 9:30:52 AM com.apple.launchd[62] ([0x0-0x3cc2cbf].SoftwareUpdateCheck[34412]) Exited with exit code: 102
4/12/08 9:30:55 AM SoftwareUpdateCheck[34424] Checking for updates
4/12/08 9:31:06 AM com.apple.launchd[62] ([0x0-0x3ccbcc8].SoftwareUpdateCheck[34431]) Exited with exit code: 148
4/12/08 9:31:12 AM com.apple.launchd[62] ([0x0-0x3cc8cc5].SoftwareUpdateCheck[34424]) Exited with exit code: 102
4/12/08 9:31:16 AM SoftwareUpdateCheck[34436] Checking for updates
4/12/08 9:31:26 AM com.apple.launchd[62] ([0x0-0x3cd1cce].SoftwareUpdateCheck[34443]) Exited with exit code: 148
4/12/08 9:31:34 AM com.apple.launchd[62] ([0x0-0x3cceccb].SoftwareUpdateCheck[34436]) Exited with exit code: 102
4/12/08 9:31:36 AM SoftwareUpdateCheck[34448] Checking for updates
4/12/08 9:31:46 AM com.apple.launchd[62] ([0x0-0x3cd7cd4].SoftwareUpdateCheck[34455]) Exited with exit code: 148
4/12/08 9:31:55 AM com.apple.launchd[62] ([0x0-0x3cd4cd1].SoftwareUpdateCheck[34448]) Exited with exit code: 102
4/12/08 9:31:57 AM SoftwareUpdateCheck[34460] Checking for updates
4/12/08 9:32:08 AM com.apple.launchd[62] ([0x0-0x3cddcda].SoftwareUpdateCheck[34467]) Exited with exit code: 148
4/12/08 9:32:15 AM com.apple.launchd[62] ([0x0-0x3cdacd7].SoftwareUpdateCheck[34460]) Exited with exit code: 102
4/12/08 9:32:18 AM SoftwareUpdateCheck[34472] Checking for updates
4/12/08 9:32:28 AM com.apple.launchd[62] ([0x0-0x3ce3ce0].SoftwareUpdateCheck[34481]) Exited with exit code: 148
4/12/08 9:32:35 AM com.apple.launchd[62] ([0x0-0x3ce0cdd].SoftwareUpdateCheck[34472]) Exited with exit code: 102
4/12/08 9:32:38 AM SoftwareUpdateCheck[34486] Checking for updates
4/12/08 9:32:48 AM com.apple.launchd[62] ([0x0-0x3ce9ce6].SoftwareUpdateCheck[34493]) Exited with exit code: 148
4/12/08 9:32:54 AM com.apple.launchd[62] ([0x0-0x3ce6ce3].SoftwareUpdateCheck[34486]) Exited with exit code: 102
4/12/08 9:32:58 AM SoftwareUpdateCheck[34498] Checking for updates
4/12/08 9:33:08 AM com.apple.launchd[62] ([0x0-0x3cefcec].SoftwareUpdateCheck[34507]) Exited with exit code: 148
4/12/08 9:33:15 AM com.apple.launchd[62] ([0x0-0x3cecce9].SoftwareUpdateCheck[34498]) Exited with exit code: 102
4/12/08 9:33:19 AM SoftwareUpdateCheck[34513] Checking for updates
4/12/08 9:33:29 AM com.apple.launchd[62] ([0x0-0x3cf6cf3].SoftwareUpdateCheck[34521]) Exited with exit code: 148
4/12/08 9:33:35 AM com.apple.launchd[62] ([0x0-0x3cf2cef].SoftwareUpdateCheck[34513]) Exited with exit code: 102
4/12/08 9:33:39 AM SoftwareUpdateCheck[34526] Checking for updates
4/12/08 9:33:49 AM com.apple.launchd[62] ([0x0-0x3cfccf9].SoftwareUpdateCheck[34533]) Exited with exit code: 148
4/12/08 9:33:55 AM com.apple.launchd[62] ([0x0-0x3cf9cf6].SoftwareUpdateCheck[34526]) Exited with exit code: 102
4/12/08 9:33:59 AM SoftwareUpdateCheck[34538] Checking for updates
4/12/08 9:34:09 AM com.apple.launchd[62] ([0x0-0x3d02cff].SoftwareUpdateCheck[34545]) Exited with exit code: 148
4/12/08 9:34:16 AM com.apple.launchd[62] ([0x0-0x3cffcfc].SoftwareUpdateCheck[34538]) Exited with exit code: 102
4/12/08 9:34:19 AM SoftwareUpdateCheck[34550] Checking for updates
4/12/08 9:34:30 AM com.apple.launchd[62] ([0x0-0x3d09d06].SoftwareUpdateCheck[34558]) Exited with exit code: 148