Hi,
Your post is over a month old, do you still have the problem?
If yes, then post what hotfix number you have updated your AC-11 to, tell us which operating system you are using and your hardware configuration.
Also, when it freezes, what have you done just prior to save? For example, can you open a new file, draw a simple wall, and then immediately save that file?
Mark
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AC-12, build2675, XP-Home-SP-2, 1Gb