This issue started happening to us and we never even upgraded our Kernel. We did apply a Windows update to another system that is on the same VM as our BW system but that shouldn't have affected our system right?
Now the disp+work.exe is in yellow status on the first bounce after the windows patching was applied and we don't know the cause.
Checked and the sapcpe.log files have no errors.
Checked and the disp+work.exe and sapstartsrv.exe version and patch level are the same.
We will try a restart of the OS next and if that fails, upgrade the Kernel on the BW system.
Just FYI