On several new IBM Thinkpads the START button at the top of my worksheet will
display VERY briefly as the sheet opens, but then disappears. I have checked
the macro security level and to insure my digital certificate is properly
installed on the machines. I cannot get the button to appear again. Reboots,
new copies of the worsheet, resetting security... nothing works.

One other thing I noticed is that it usually starts happening after the user
takes its laptop and plugs into a different LAN port elsewhere in the
building.

Any advice would be greatly appreciated!! Thanks, patrick