Is there really no undo function in map maker, or do I have an old version of MapMaker? (...says MapMaker version 8.5.1)
Thanks for any help.
Not exactly an Undo but after you have saved the Map once - you can click on File > Revert to Saved Copy to Undo it.
As the OAG suggests - "save often during map creation"
http://www.solarwinds.com/NetPerfMon/SolarWinds/OrionAdministratorGuide.1.104.htm