I have no Mac, but this error comes also on Windows7, if you have shut on the preview in file-manager and you have only choose the data-file for therion. Greetings Markus Von: therion-bounces@speleo.sk [mailto:therion-bounces@speleo.sk] Im Auftrag von Dave Clucas Gesendet: Mittwoch, 16. April 2014 16:40 An: therion@speleo.sk Betreff: [Therion] Can't open data.log file for input I'm running Therion v 5.3.11 on a Mac. I've just reinstalled Mavericks to fix a problem and now get the following error. Anyone know what the problem is? ####################### metapost log file ######################## therion: warning -- can't open data.log file for input can't open data.log file for input#################### end of metapost log file #################### therion: error -- metapost exit code -- 32512 writing xtherion file ... done Dave Clucas dave.clucas@icloud.com