Actually, issue captured on 1.3.9.
After upgrade, it seems that plugin assumes cleartool binary to be "cleartool.cmd" instead of cleartool.exe.
In at least clearcase 7.0.1.12, it results crashes of the plugin (see stacktrace below), even when trying to poll for changes.
What's also interesting is that the build continues to be triggered all the time, so with eg. 1 minute "quiet period", every 1 minut there is a failed build.

Building remotely on BarSlave in workspace D:\JenkinsData\workspace\FOO_RELEASE_Integration
[FOO_RELEASE_Integration] $ "C:\Program Files\Rational\ClearCase\\bin\cleartool.cmd" lsview FOO_jenkins_integration_release
[INFO] computeChangeLogBeforeCheckout = false
[INFO] computeChangeLogAfterCheckout = false
[FOO_RELEASE_Integration] $ "C:\Program Files\Rational\ClearCase\\bin\cleartool.cmd" startview FOO_jenkins_integration_release
java.io.IOException: Cannot run program "C:\Program Files\Rational\ClearCase\\bin\cleartool.cmd" (in directory "D:\JenkinsData\workspace\FOO_RELEASE_Integration"): CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(Unknown Source)
at hudson.Proc$LocalProc.<init>(Proc.java:244)
at hudson.Proc$LocalProc.<init>(Proc.java:216)
at hudson.Launcher$LocalLauncher.launch(Launcher.java:709)
at hudson.Launcher$ProcStarter.start(Launcher.java:338)
at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:934)
at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:901)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:287)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at hudson.remoting.Engine$1$1.run(Engine.java:60)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 17 more
[xUnit] [INFO] - Starting to record.
[xUnit] [INFO] - Processing NUnit-Version N/A (default)