Tom This sounds familiar. The following forum thread lead to a bug discovery in 5.2.13 in around 2009. https://www.mail-archive.com/therion@speleo.sk/msg02664.html But I assume that is not what is going on in this case. There are some other threads that might hold clues, but I don’t have any helpful suggestions sorry. https://www.mail-archive.com/therion@speleo.sk/msg02506.html Bruce From: Therion [mailto:therion-bounces@speleo.sk] On Behalf Of Tom Foord via Therion Sent: Tuesday, 14 February 2017 11:26 AM To: therion@speleo.sk Cc: Tom Foord <tomfoord@gmail.com> Subject: [Therion] Scale dependant error when using area fills Hi all I'm having some problems compiling a project which includes debris area fills. Depending on the exact symbol fill that I use, I am getting strange scale-dependant errors which seem to cause the compiler to loop endlessly until I force it to stop. I originally noticed the problem when using a custom area fill that I made by modifying the standard a_debris_AUT symbol fill. I've attached my modified metapost definition in the attached text file 'a_debris_WUG.txt'. The error occurs for any scale between 1:2000 and 1:4483 (outside of this range the project compiles fine). See attached output log 'Output log - a_debris_WUG.txt'. As you can see, the file seems to loop over and over again. Initially I thought this problem was specific to my custom fill, but then I noticed that I also get a similar error when using the standard a_debris_AUT fill, however this time the error only occurs when the scale is set to exactly 1:2000 (any other scale seems to be fine). See attached output log 'Output log - a_debris_AUT.txt'. Can anyone help with this problem? Thanks Tom