nimda schrieb:
> and now in the edit menu the entries for undo and redo are permanently grayed
> out so I can't use those features anymore, it is as if the history file is
> somewhat damaged or has lost its right permessions?

Try "Editor / Editor Preferences..."; in the dialog, go to the "Misc" 
tab. In the bottom-right of that pane, there's a "Max undoable actions" 
section; make sure it's set to "Unlimited", or "Limited to" something 
sufficiently larger than 0.

If it already appears to be set to a sane value, you may try changing 
it, closing and re-starting POV-Ray, then setting it back to "Unlimited" 
and again restarting POV-Ray. Just in case something in the undo 
mechanism got "jammed", this might "shake" it enough so that things fall 
  back into place.

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