I faced a strange error yesterday evening when a project should produce its nightly setup. The CC plugin says:

Removing view because the view tag of the job SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x doesn't match the current view tag SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x

I just copy both view tags here again for clarity:
SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x

They look absolutely the same to me?!?

I also have seen this error after rebooting the master due to Windows updates. This only happens with views on my master, rebooting a slave with snapshots does not affect jobs running there.

If could help with some command line investigations – no problem.
Running one of the command like the log suggests causes an error when issued by hand:

C:\Users\sa_mu_1sp1cm-build>cleartool lsview -cview -s SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
cleartool: Error: Extra arguments: "SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x"
Usage: lsview [-short | -long] [-host hostname [-quick]]
[-properties [-full | -text_mode] | -age]
[-region 'network-region-pattern']
[-cview | 'view-tag-pattern' ...

Full Log of the job:

19:44:18 [EnvInject] - Loading node environment variables.
19:44:18 Building on master in workspace C:\Snapshots
19:44:18 [RS-PQA-3.2x] $ cleartool lsview -cview -s
19:44:18 SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
19:44:18 [Snapshots] $ cleartool lsview SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
19:44:18 SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x \\CONTEST-MASTER\ccstg_c\views\SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x.vws
19:44:18 [INFO] computeChangeLogBeforeCheckout = false
19:44:18 [INFO] computeChangeLogAfterCheckout = true
19:44:18 [Snapshots] $ cleartool lsview SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
19:44:18 SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x \\CONTEST-MASTER\ccstg_c\views\SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x.vws
19:44:18 [RS-PQA-3.2x] $ cleartool lsview -cview -s
19:44:18 SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
19:44:28 Process leaked file descriptors. See http://wiki.jenkins-ci.org/display/JENKINS/Spawning+processes+from+build for more information
19:44:28 Removing view because the view tag of the job SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x doesn't match the current view tag SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
19:44:28 Process leaked file descriptors. See http://wiki.jenkins-ci.org/display/JENKINS/Spawning+processes+from+build for more information
19:44:28 [Snapshots] $ cleartool rmview -force RS-PQA-3.2x
19:44:28 Removing references from VOB "\ts89xy_cm" ...
19:44:28 Removed references to view "C:\Snapshots\RS-PQA-3.2x" from VOB "\ts89xy_cm".
19:44:28 Removing references from VOB "\contest_sw" ...
19:44:29 Removed references to view "C:\Snapshots\RS-PQA-3.2x" from VOB "\contest_sw".
19:44:29 Removing references from VOB "\contest_bin" ...
19:44:29 Removed references to view "C:\Snapshots\RS-PQA-3.2x" from VOB "\contest_bin".
19:44:29 Removing references from VOB "\contest_sw_cmwperf" ...
19:44:29 Removed references to view "C:\Snapshots\RS-PQA-3.2x" from VOB "\contest_sw_cmwperf".
19:44:49 Removing the job view tag because we detected that it already exists.
19:44:49 [Snapshots] $ cleartool rmview -force -tag SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
19:44:49 cleartool: Error: View tag not found: "SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x".
19:44:49 cleartool: Error: Unable to remove view "SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x".
19:44:49 FATAL: Base ClearCase failed. exit code=1
19:44:49 [Snapshots] $ cleartool rmtag -view SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x
19:44:49 cleartool: Error: Unable to remove "SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x": ClearCase object not found.
19:44:49 FATAL: Base ClearCase failed. exit code=1
19:44:49 java.io.IOException: cleartool did not return the expected exit code. Command line="rmtag -view SA_MU_1SP1CM-BUILD_CONTEST-MASTER_RS-PQA-3.2x", actual exit code=1
19:44:49 at hudson.plugins.clearcase.HudsonClearToolLauncher.run(HudsonClearToolLauncher.java:121)
19:44:49 at hudson.plugins.clearcase.ClearToolExec.runAndProcessOutput(ClearToolExec.java:812)
19:44:49 at hudson.plugins.clearcase.ClearToolExec.rmtag(ClearToolExec.java:786)
19:44:49 at hudson.plugins.clearcase.action.SnapshotCheckoutAction.rmviewtag(SnapshotCheckoutAction.java:173)
19:44:49 at hudson.plugins.clearcase.action.SnapshotCheckoutAction.cleanAndCreateViewIfNeeded(SnapshotCheckoutAction.java:135)
19:44:49 at hudson.plugins.clearcase.action.BaseSnapshotCheckoutAction.checkout(BaseSnapshotCheckoutAction.java:53)
19:44:49 at hudson.plugins.clearcase.AbstractClearCaseScm.checkout(AbstractClearCaseScm.java:667)
19:44:49 at hudson.model.AbstractProject.checkout(AbstractProject.java:1369)
19:44:49 at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:676)
19:44:49 at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
19:44:49 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:581)
19:44:49 at hudson.model.Run.execute(Run.java:1575)
19:44:49 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
19:44:49 at hudson.model.ResourceController.execute(ResourceController.java:88)
19:44:49 at hudson.model.Executor.run(Executor.java:241)
19:44:49 [WARNINGS] Skipping publisher since build result is FAILURE