ClearTool Error: Operation "get cleartext" failed: Permission denied.

When trying to compile a project with TeamCity, I am getting an error from cleartool, saying that: "get cleartext" failed: Permission denied.

The command that is failing is a call to cleartool get:
cleartool get -to C:\TeamCity\temp\cc_35875temp V:\andrew_CI_view\My_vob\MyProject@@\main\branch\7\Apps\main\branch\1\MyProject.Apps.FileTransferUtility\main\branch\1\App.xaml\main\branch\1
What's strange though, is that if I manually execute this command from the command line, it works fine (ERRORLEVEL is 0, no error messages, etc).

Has anyone else seen such a message, or have any idea what could be wrong?

Here are the details of my setup:
  TeamCity Professional Version 4.5.5 (build 9103)
  TeamCity is using the my user account for its Build Agent.
  TeamCity is attempting to connect to a ClearCase Dynamic view:
  D:\CCdata\snapview\andrew_CI_view

Settings from the Administration > Edit Build Configuration > Edit VCS Root Page:
  Type of VCS: ClearCase
  ClearCase View Path: V:\andrew_CI_view
  Relative path within the view: My_vob\MyProject
  Use ClearCase: BASE
  No Checkout Rules

ClearCase 7.0.1.3-IFIX01
  Config Spec for Dynamic View:
      element * CHECKEDOUT
      element * .../MyProject/LATEST


Here are the relevant lines from the teamcity-vcs.log

[2009-11-25 13:20:20,905]   INFO [ Cached pool 12] -      jetbrains.buildServer.VCS - ClearCase executing cleartool get -to C:\TeamCity\temp\cc_35875temp V:\andrew_CI_view\My_vob\MyProject@@\main\branch\7\Apps\main\branch\1\MyProject.Apps.FileTransferUtility\main\branch\1\App.xaml\main\branch\1
[2009-11-25 13:20:20,905]   INFO [ Cached pool 12] - .clearcase.ClearCaseConnection - interactive execute: cleartool get -to C:\TeamCity\temp\cc_35875temp V:\andrew_CI_view\My_vob\MyProject@@\main\branch\7\Apps\main\branch\1\MyProject.Apps.FileTransferUtility\main\branch\1\App.xaml\main\branch\1
[2009-11-25 13:20:21,155]   INFO [ Cached pool 12] -      jetbrains.buildServer.VCS - ClearCase executing cleartool quit
[2009-11-25 13:20:21,155]   INFO [ Cached pool 12] - .clearcase.ClearCaseConnection - interactive execute: cleartool quit
[2009-11-25 13:20:21,155]   WARN [ Cached pool 12] -      jetbrains.buildServer.VCS - Failed to build patch for build #15, build id: 17, VCS root: ClearCaseVCS, due to error: java.io.IOException: cleartool: Error: Operation "get cleartext" failed: Permission denied.

jetbrains.buildServer.vcs.VcsException: java.io.IOException: cleartool: Error: Operation "get cleartext" failed: Permission denied.

    at jetbrains.buildServer.buildTriggers.vcs.clearcase.CCPatchProvider.loadFile(CCPatchProvider.java:171)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.CCPatchProvider.access$200(CCPatchProvider.java:31)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.CCPatchProvider$2.processFile(CCPatchProvider.java:111)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.structure.CacheProcessor.processAllRevisions(CacheProcessor.java:71)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.structure.CacheElement.processAllVersionsInternal(CacheElement.java:178)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.structure.CacheElement.processAllVersions(CacheElement.java:96)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.ClearCaseConnection.processAllVersions(ClearCaseConnection.java:665)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.CCPatchProvider.buildPatch(CCPatchProvider.java:52)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.ClearCaseSupport.buildPatchForConnection(ClearCaseSupport.java:294)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.ClearCaseSupport.buildPatch(ClearCaseSupport.java:281)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.ClearCaseSupport$7.buildPatch(ClearCaseSupport.java:755)
    at jetbrains.buildServer.serverSide.impl.projectSources.BuildPatchUtil$1.buildPatch(BuildPatchUtil.java:2)
    at jetbrains.buildServer.vcs.VcsSupportUtil.buildPatch(VcsSupportUtil.java:81)
    at jetbrains.buildServer.serverSide.impl.projectSources.BuildPatchUtil.buildPatch(BuildPatchUtil.java:2)
    at jetbrains.buildServer.serverSide.impl.projectSources.PatchComposer.buildCleanPatchToStream(PatchComposer.java:121)
    at jetbrains.buildServer.serverSide.impl.projectSources.PatchComposer.access$100(PatchComposer.java:65)
    at jetbrains.buildServer.serverSide.impl.projectSources.PatchComposer$2.constructPatch(PatchComposer.java:1)
    at jetbrains.buildServer.serverSide.impl.projectSources.SmallPatchCache.getCachedCleanPatch(SmallPatchCache.java:36)
    at jetbrains.buildServer.serverSide.impl.projectSources.PatchCacheImpl.requestCachedPatch(PatchCacheImpl.java:25)
    at jetbrains.buildServer.serverSide.impl.projectSources.PatchComposer.getOrMakeCacheableCleanPatch(PatchComposer.java:140)
    at jetbrains.buildServer.serverSide.impl.projectSources.PatchComposer.makePatch(PatchComposer.java:36)
    at jetbrains.buildServer.serverSide.impl.projectSources.PatchComposer.buildPatchForRoot(PatchComposer.java:71)
    at jetbrains.buildServer.serverSide.impl.projectSources.PatchComposer.buildPatch(PatchComposer.java:125)
    at jetbrains.buildServer.serverSide.impl.BuildTypeImpl.buildPatch(BuildTypeImpl.java:290)
    at jetbrains.buildServer.serverSide.impl.BuildTypeImpl$$FastClassByCGLIB$$a84db719.invoke(<generated>)
    at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
    at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
    at jetbrains.buildServer.serverSide.impl.auth.TeamCityMethodSecurityInterceptor.invoke(TeamCityMethodSecurityInterceptor.java:33)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at org.springframework.aop.framework.Cglib2AopProxy$FixedChainStaticTargetInterceptor.intercept(Cglib2AopProxy.java:582)
    at jetbrains.buildServer.serverSide.impl.BuildTypeImpl$$EnhancerByCGLIB$$effc1aaa.buildPatch(<generated>)
    at jetbrains.buildServer.serverSide.impl.BuildStarter$2.call(BuildStarter.java:5)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
    at java.util.concurrent.FutureTask.run(FutureTask.java:123)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
    at java.lang.Thread.run(Thread.java:595)
Caused by: java.io.IOException: cleartool: Error: Operation "get cleartext" failed: Permission denied.

    at jetbrains.buildServer.buildTriggers.vcs.clearcase.process.InteractiveProcess.executeAndReturnProcessInput(InteractiveProcess.java:64)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.ClearCaseConnection$ClearCaseInteractiveProcess.copyFileContentTo(ClearCaseConnection.java:997)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.ClearCaseConnection.loadFileContent(ClearCaseConnection.java:308)
    at jetbrains.buildServer.buildTriggers.vcs.clearcase.CCPatchProvider.loadFile(CCPatchProvider.java:141)
    ... 37 more