Turns out that this one: > Removing non-selected maps (if comment out in the master .th file for > the area maps that aren't selected in the .thconfig file that causes > the problem, it compiles without errors).
wasn't true - I've managed to shrink the problem down to a data set consisting of: custom symbol definitions survex .3d file .th2 files for one cave .th2 file containing a surface grid stripped-down .thconfig file a couple of .th files that tie things together. The whole thing now fits in a <200K .zip file, which I will send to Martin Budaj It's quite a large minimal sample, but I'm struggling to find anything else that I can remove or change without the error vanishing. to Martin B: thanks for offering to look into this! Duncan.
