I have noticed that marked text in math mode in lyx 1.2.0 is often
lost (probably erased from the buffer). I could not find a rule to 
model such behaviour, but here is one the possible occurrences:

  - mark a text in math mode
  - copy to buffer (ctrl-c)
  - move to a new location within the same math input area, then 
    enter a superscript
  - paste buffer content (crtl-v)
     no text from the buffer

maybe an already known bug...
--
Paolo

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