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I can't tell you how many times I've accidentally clicked the Freeze Column button in an analysis. This causes the data table to become embedded, and there is no way to un-embed it. Thus I lose would, and because there's no version control in Spotfire, I have to redo things. Very bad.
If you accidentally select to freeze a column in the Edit Expression dialog you have a couple of ways to recover before you save the file. You can click Cancel instead of ok in the dialog or you can select to undo the freeze by selecting undo after closing the dialog.
Also note that you can edit almost all column properties including accessing the edit expression dialog from the new extended data panel that was introduced in Spotfire 7.0. The freeze functionality is not available from there so if you want to avoid the risk of selecting it I suggest you access the edit expression functionality from the data panel instead of going through the column properties dialog.