I have MikTeX still installed and I downloaded context/install/mswincontext.zip (6.12.04) as well (I compile ConTeXt sources with "F7" within scite). The latter started to behave strange just "in the middle of the black". I have a document with 30 sites and about 3MB (some high resolution images) which worked just fine until some point. After 10 minutes pdfeTeX started crashing (and asking if the problem should be reported to Microsoft). If I compile the same document under MikTeX, it works just fine (except that I can't use \setupbodyfont[phv,ss,14.4pt] command). If I compile the document in some other directory (with no images) it works as well. Even more strange: after removing font definitions (both \setupbodyfont[phv,ss,14.4pt] and \usetypescript[adobekb][texnansi] \usetypescript[times][texnansi] \setupbodyfont[times,ss] cause problems) I get some strange error reports (see below), which I have to skip with some unusual combinations of Ctrl-C and quit, but the file compiles without a crash. The problem was most probably caused by PNG images, exported from MS PowerPoint slides, an example is on http://pub.mojca.org/mailinglists/context/alpha.png. They look just fine in any viewer, but as soon as I remove them, everything works perfect again. It looks like a very strange bug. Any ideas? Mojca ***************************************************************** Error report: ./img/eij-d1qksa2-ms.jpg ./img/pathway.png ./img/betacontacts.png libpng warning: Ignoring bad row filter type ... (n times) ibpng warning: Ignoring bad row filter type libpng warning: Ignoring bad row fil Error: pdfetex.exe: libpng: internal error ==> Fatal error occurred, the output PDF file is not finished! ter type libpng warning: Ignoring bad row filter type ... (n times) ibpng warning: Ignoring bad row filter type ibpng warning: Ignoring bad row filter type libpng error: incorrect data check This is pdfeTeX, Version 3.141592-1.20a-2.2 (Web2c 7.5.3) \write18 enabled. (c:\PROGRA~1\context\tex\texmf-local/web2c/natural.tcx) **Please type the name of your input file. **