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In trying to compile a LARGE project (585 pages, 260 figures, 27 tables, indexing, bibliography, ...), I produce an obscure luatex error: luatex: ../../../source/texk/web2c/luatexdir/tex/printing.c:266: print: Assertion `c < 256' failed. [329.327MTXrun | fatal error, no return code, message: luatex: execution interrupted probably due to a floatblock or other buffer overflow, I suspect. For if I remove about half of the chapters from the project, it will compile. Latest "minimals" distribution: ConTeXt ver: 2009.10.02 13:14 MKIV fmt: 2009.10.15 int: english/english mkiv lua stats : luatex banner - this is luatex, version beta-0.43.0-2009081914 I have tried both amd64 and i386, and both fail at the same point, so it is not a problem of (dynamic) memory allocation (there is more available on the first machine). The full project compiles under mkii but systematically fails under mkiv. Unfortunately, I cannot produce a "minimal" example... Can someone suggest how I should proceed, such as any configuration file that can be tuned... ? Thanks Alan