Hudson 1.262, CC plugin 0.7.1.

Have 6 jobs which were all blue (previous builds good). No config changes.
Hourly trigger kicked in and they all failed, with message:

started
[workspace] $ "C:\Program Files\Rational\ClearCase\bin\cleartool.exe" mkview
-snapshot -tag wendy_cgate_main_compile wendy_cgate_main_compile
cleartool: Error: A registry entry already exists for "wendy_cgate_main_compile".
FATAL: Base ClearCase failed. exit code=1
FATAL: cleartool did not return the expected exit code. Command line="mkview
-snapshot -tag wendy_cgate_main_compile wendy_cgate_main_compile", actual exit
code=1
java.io.IOException: cleartool did not return the expected exit code. Command
line="mkview -snapshot -tag wendy_cgate_main_compile wendy_cgate_main_compile",
actual exit code=1
at
hudson.plugins.clearcase.HudsonClearToolLauncher.run(HudsonClearToolLauncher.java:72)
at hudson.plugins.clearcase.ClearToolSnapshot.mkview(ClearToolSnapshot.java:53)
at
hudson.plugins.clearcase.action.SnapshotCheckoutAction.checkout(SnapshotCheckoutAction.java:43)
at
hudson.plugins.clearcase.AbstractClearCaseScm.checkout(AbstractClearCaseScm.java:199)
at hudson.model.AbstractProject.checkout(AbstractProject.java:666)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:261)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:235)
at hudson.model.Run.run(Run.java:817)
at hudson.model.Build.run(Build.java:88)
at hudson.model.ResourceController.execute(ResourceController.java:70)
at hudson.model.Executor.run(Executor.java:90)