Hi, The problem of bug 9302 is that the buffer pointer of insets in the internal clipboard is not set, but it is used for conversion to plain text (which is an intermediate step for pasting into math).
I have a fix which simply re-uses the mechanism for copying to the external clipboard also for pasting text into math (see http://www.lyx.org/trac/attachment/ticket/9302/9302.diff): Channel everything through a temporary buffer. This fix works fine, but it might be considered overkill. Does anybody have a better idea? If not, I'll put it in. The bug 9302 has a milestone 2.1.3. Is this to be taken seriously, i.e. should the fix also go to the stable branch? Georg