We have confirmed this problem with the current MOSS editor. Currently, the only workaround seems to be manually deploying the solution elements on the second server. What you need to do is:
1. copy the DLLs to the machine's GAC
2. copy the RadControls folder to \Program Files\Common Files\Microsoft Shared\web server extensions\wpresources\
3. copy the two features to \Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\FEATURES\ and install them using stsadm:
stsadm -o installfeature -name RadEditorFeature
stsadm -o installfeature -name RadEditorFeatureIE
4. copy the web.config settins over from the deployed server (<SafeControl> elements).
Next week, we have a scheduled update for the MOSS RadEditor. We will try to resolve this issue until then, but unfortunately I cannot give you an 100% guarantee at this moment.
the Telerik team