scm.exe error if build user not logged in (Windows)

We have RTC (2.0.0.2 iFix5) builds running with the the Build Forge
integration and have a puzzling problem employing the scm command line on Windows -- wondering if anyone else has seen
and/or can explain... I know when it happens and how to prevent
it, but not exactly why...

Our build machines are Windows 2003 SP2 (32-bit and 64-bit -- both
exhibit the same behavior) with the BF agent running as a service.
If, for some reason (say, Windows updates) the system is restarted
and the build user doesn't log in, we get the following from scm.exe:

Password (user @ rtcserver):
JVMDUMP006I Processing dump event "systhrow", detail "java/lang/OutOfMemoryError" - please wait.
JVMDUMP032I JVM requested Snap dump using 'E:\build\Snap.20110222.195339.3104.0001.trc' in response to an event
JVMDUMP010I Snap dump written to E:\build\Snap.20110222.195339.3104.0001.trc
JVMDUMP032I JVM requested Heap dump using 'E:\build\heapdump.20110222.195339.3104.0002.phd' in response to an event
JVMDUMP010I Heap dump written to E:\build\heapdump.20110222.195339.3104.0002.phd
JVMDUMP032I JVM requested Java dump using 'E:\build\javacore.20110222.195339.3104.0003.txt' in response to an event
JVMDUMP010I Java dump written to E:\build\javacore.20110222.195339.3104.0003.txt
JVMDUMP013I Processed dump event "systhrow", detail "java/lang/OutOfMemoryError".
Unexpected exception
java.lang.OutOfMemoryError
at java.lang.StringBuffer.ensureCapacityImpl(StringBuffer.java:386)
at java.lang.StringBuffer.append(StringBuffer.java:146)
at com.ibm.team.filesystem.cli.core.util.PasswordReader.run(Unknown Source)
at com.ibm.team.filesystem.cli.core.util.PromptUtil.prompt(Unknown Source)
at com.ibm.team.filesystem.cli.core.internal.LocalContext.getPassword(Unknown Source)
at com.ibm.team.filesystem.cli.core.internal.ClientConfiguration.getConnectionInfo(Unknown Source)
at com.ibm.team.filesystem.cli.core.internal.ClientConfiguration$$Cold.getConnectionInfo(Unknown Source)
at com.ibm.team.filesystem.cli.core.internal.ClientConfiguration.getConnectionInfo(Unknown Source)
at com.ibm.team.filesystem.cli.client.internal.subcommands.LoadCmdLauncher.run(LoadCmdLauncher.java:76)
at com.ibm.team.filesystem.cli.core.internal.SubcommandLauncher.run(Unknown Source)
at com.ibm.team.filesystem.cli.core.internal.SubcommandLauncher.doStart(Unknown Source)
at com.ibm.team.filesystem.cli.core.internal.SubcommandLauncher.run(Unknown Source)
at com.ibm.team.filesystem.cli.core.internal.Application.start(Unknown Source)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(Unknown Source)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(Unknown Source)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(Unknown Source)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:618)
at org.eclipse.equinox.launcher.Main.invokeFramework(Unknown Source)
at org.eclipse.equinox.launcher.Main.basicRun(Unknown Source)
at org.eclipse.equinox.launcher.Main.run(Unknown Source)
Scm:
An error has occurred. See the log file
E:\dev\RTC-2.0.0.2-Win\scmtools\eclipse\configuration\1298422096509.log.

I gather scm is trying to put up a password prompt and it's failing
due to no access to the console... But, we're relying on creds
stored in the user's home directory via scm login command so
I'm not sure where the "Password:" prompt comes from and/or
how to suppress it.

The solution is to have the build user logged in on the console
via remote desktop at all times -- it would be nice not to have to
do so...

Thanks for any insight!