Just installed LyX1.2.1 and ran into troubles (a bug?) with equation labels containing underscores.
When inserting an equation and giving it a label like
"eq:interesting_equation", the next time you open the document
containing the equation, the label is changed to
"eq:interesting_{e}quation", so braces are inserted after the
underscore, causing all references to the label to become invalid.
Koen
