Maybe this is my fault. The simpleslides module works just fine these days and I "accidentally" updated the ConTeXt to the latest version: context --version mtx-context | ConTeXt Process Management 0.60 mtx-context | mtx-context | main context file: /opt/context/tex/texmf-context/tex/context/base/context.mkiv mtx-context | current version: 2013.02.13 18:06 and this small piece of code failed to compile: \usemodule[simpleslides][style=BigNumber] \starttext \SlideTitle{Test} test \stoptext and gave me the following error message: simpleslides > loading Big Number style system > command \NormalHeight is already defined system > command \NormalWidth is already defined system > command \PictureFrameHeight is already defined system > command \PictureFrameWidth is already defined colors > rgb color space is supported colors > cmyk color space is supported )) fonts > bodyfont 24.0414pt is defined (can better be done global) metapost > initializing instance 'metafun' using format 'metafun' metapost > loading 'metafun': /opt/context/tex/texmf-context/metapost/context/base/metafun.mpiv, using method: default metapost > initializing number mode "scaled" *** glibc detected *** luatex: double free or corruption (fasttop): 0x00000000057da5a0 *** ======= Backtrace: ========= /lib64/libc.so.6(+0x7d836)[0x7ff8ff104836] luatex(mp_free_node+0x3b)[0x6406fb] luatex[0x66637c] luatex[0x6743be] luatex[0x6724b8] luatex[0x670210] there're more and if it is important for the diagnostics please let me know and I will provide the whole message which I thought was relevant. Anyone can confirm this? -- Best Regards Chen