Hallo, I got a strange error after running LyX and trying to export it as pdflatex: pdfTeX error (ext4): \pdendflink ended up in different nesting level than \pd
which I traced to Lichtflüssen zwischen 0.5 und 75\thinspace\mathrm{\mu mol/m^{2}/s} (siehe Abbildung [fig:Licht-Sharma]). Bei Flüssen bis zu 20\mathrm{\thinspace\mu mol/m^{2}/s} änderte sich die Periode nicht If I take the 20\mathrm{\thinspace\mu mol/m^{2}/s} out, the error is gone and the pdf output works. Now if I copy 75\thinspace\mathrm{\mu mol/m^{2}/s} to the place of 20\mathrm{\thinspace\mu mol/m^{2}/s} (replacing it) I get again the error meaning that it is not the sequence \thinspace\mathrm respectively \mathrm{\thinspace which caused the error The strangest finding is, if I put the Bibtex generated Bibliography mark at the end of my Koma book (twosided, twocolumn) in a lyx note thus commenting it out the error vanishs. This was in fact the way I started the search for the error, because I thought removing the Bibliography entrance is a fast and effective way to find out whether a reference is causing the problem. ##### In the meantime I have experimented a bit more stripping my document to a few lines and it seems that the upgreek is causing the trouble. ---> Package upgreek Info: Using Euler Roman for upright Greek on input line 31. \symugrf@m=\mathgroup6 LaTeX Font Info: Overwriting symbol font `ugrf@m' in version `bold' (Font) U/eur/m/n --> U/eur/b/n on input line 38. ) but why does the erro occur only if I use the math expression twice? Wolfgang