Ok so I've googled this error a million times and have tried everything but cannot shake it. I am getting this error sporadically on all types of sheets, both large and even some blank ones!!! It has nothing to do with formulas or links or tabs or copy/paste or any of the things I've read can cause it. I have deleted app data, xlb files, done a repair of office, done a full uninstall, cleaned the registry and then a reinstall, etc etc. It does it on any user profile on the machine as well. I'm at a loss!