Thank you for your reply and help. There are errors in the .log file, but they don't mean much to me. Here is the contents of the .log file for the last session:
!SESSION 2010-12-20 14:42:29.319 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.6.0_22
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments: -keyring /Users/herbert/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch x86_64 -clean -keyring /Users/herbert/.eclipse_keyring -showlocation
!ENTRY org.eclipse.core.net 1 0 2010-12-20 14:43:00.762
!MESSAGE System property http.nonProxyHosts has been set to local|*.local|169.254/16|*.169.254/16 by an external source. This value will be overwritten using the values from the preferences
!ENTRY org.eclipse.core.jobs 4 2 2010-12-20 14:43:05.787
!MESSAGE An internal error occurred during: "Contacting Software Sites".
!STACK 0
java.lang.NullPointerException
at org.eclipse.equinox.internal.p2.repository.RepositoryTransport.download(RepositoryTransport.java:75)
at org.eclipse.equinox.internal.p2.repository.RepositoryTransport.download(RepositoryTransport.java:127)
at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadIndexFile(AbstractRepositoryManager.java:718)
at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:639)
at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:96)
at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92)
at org.eclipse.equinox.p2.ui.LoadMetadataRepositoryJob.doLoad(LoadMetadataRepositoryJob.java:115)
at org.eclipse.equinox.p2.ui.LoadMetadataRepositoryJob.runModal(LoadMetadataRepositoryJob.java:100)
at org.eclipse.equinox.p2.operations.ProvisioningJob.run(ProvisioningJob.java:177)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
!SESSION 2010-12-20 14:42:29.319 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.6.0_22
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments: -keyring /Users/herbert/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch x86_64 -clean -keyring /Users/herbert/.eclipse_keyring -showlocation
!ENTRY org.eclipse.core.net 1 0 2010-12-20 14:43:00.762
!MESSAGE System property http.nonProxyHosts has been set to local|*.local|169.254/16|*.169.254/16 by an external source. This value will be overwritten using the values from the preferences
!ENTRY org.eclipse.core.jobs 4 2 2010-12-20 14:43:05.787
!MESSAGE An internal error occurred during: "Contacting Software Sites".
!STACK 0
java.lang.NullPointerException
at org.eclipse.equinox.internal.p2.repository.RepositoryTransport.download(RepositoryTransport.java:75)
at org.eclipse.equinox.internal.p2.repository.RepositoryTransport.download(RepositoryTransport.java:127)
at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadIndexFile(AbstractRepositoryManager.java:718)
at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:639)
at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:96)
at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92)
at org.eclipse.equinox.p2.ui.LoadMetadataRepositoryJob.doLoad(LoadMetadataRepositoryJob.java:115)
at org.eclipse.equinox.p2.ui.LoadMetadataRepositoryJob.runModal(LoadMetadataRepositoryJob.java:100)
at org.eclipse.equinox.p2.operations.ProvisioningJob.run(ProvisioningJob.java:177)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Best wishes,
Herbert