Now I'm not exactly worried by this, but the mathed output has changed in the last week or so:
diff -u old.lyx new.lyx
-\begin_inset Formula $J_{\mathrm{xa}}$
+\begin_inset Formula $ J_{\mathrm{xa}}$
\end_inset
,
-\begin_inset Formula $J_{\mathrm{ya}}$
+\begin_inset Formula $ J_{\mathrm{ya}}$
It seems to me that the extra whitespace is probably an oversight...
Angus
