Hi Taco, As we discussed by chat ... there is a buffer overflow when the amount of chars fed into lua is large: Error: luatex.exe: buffer overflow at file ../../../../src/texk/web2c/luatexdir /utils.c, line 177 Low priority bug since it was an extreme case. Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------