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I saved the project and tried with different types of shape tweens (eg: colour changes, shape changes), but every time I close the program it's as if I never made the shape tweens. I don't think I had this issue before, is it a bug?
See if this is of any help: http://flash-powertools.com/suddenly-broken-shape-tweens-in-flash-animate-after-a-crash/
Also: try going to the Modify menu and choose Document... In the Document Settings dialog that opens, press OK and then Save As... - save your file with a different name.