open the attached file and try to click into the matharea:
-> nothing happens, cursor handling is wrong when the
mathbox is wider than the workarea.
Herbert
#LyX 1.2 created this file. For more info see http://www.lyx.org/
\lyxformat 220
\textclass book
\begin_preamble
\usepackage{pst-plot}
\listfiles
\end_preamble
\language german
\inputencoding latin9
\fontscheme default
\graphics default
\paperfontsize 10
\spacing single
\papersize a4paper
\paperpackage a4
\use_geometry 0
\use_amsmath 1
\use_natbib 0
\use_numerical_citations 0
\paperorientation portrait
\secnumdepth 3
\tocdepth 3
\paragraph_separation skip
\defskip medskip
\quotes_language german
\quotes_times 2
\papercolumns 1
\papersides 1
\paperpagestyle default
\layout Standard
skdhf kjgh fLÖSDH GFs ASd fg gdsh sgh FGldfsJSD GsLF Lfgljdg [text adfg
adf gdaf g skdhf kjgh fLÖSDH GFs ASd fg gdsh sgh FGlJSD skdhf kjgh fLÖSDH
GFs ASd fg gdsh sgh FGlJSD skdhf kjgh fLÖSDH GFs ASd fg gdsh sgh FGlJSD
skdhf kjgh fLÖSDH GFs ASd fg gdsh sgh FGlJSD
\layout Standard
\begin_inset Formula \[
\underbrace{x^{2}+2{\displaystyle \frac{p}{2}x+\left({\displaystyle
\frac{p}{2}}\right)^{2}}}-\left({\displaystyle \frac{p}{2}}\right)^{2}+q\qquad
\underbrace{x^{2}+2{\displaystyle \frac{p}{2}x+\left({\displaystyle
\frac{p}{2}}\right)^{2}}}-\left({\displaystyle \frac{p}{2}}\right)^{2}+q\qquad
\underbrace{x^{2}+2{\displaystyle \frac{p}{2}x+\left({\displaystyle
\frac{p}{2}}\right)^{2}}}-\left({\displaystyle \frac{p}{2}}\right)^{2}+q\qquad
\underbrace{x^{2}+2{\displaystyle \frac{p}{2}x+\left({\displaystyle
\frac{p}{2}}\right)^{2}}}-\left({\displaystyle \frac{p}{2}}\right)^{2}+q\]
\end_inset
\the_end
