View Single Post
In the Finder, select the OO document, and do Show Package Contents from the gear menu or the contextual popup menu. You'll get a new window that contains a contents.xml file and possibly some other files. Open the contents.xml file with a suitable editor (TextWrangler works and is free) and search for a line that looks something like:

Code:
  <editor content-size="{699, 764}" scroll-position="{0, 3106}" scale="1.5" column-titles-display-mode="auto" status-visible="no">
Remove the scale="1.5" directive and save the file. You should now be back at 100% zoom. The value of the scale factor is the zoom percentage/100, so 1.5 represents a 150% zoom, 2 represents 200% zoom, etc. Might not be a bad idea to make a backup of the file first. Make sure you don't have the file open in OmniOutliner while you are doing this.