Hello, Hello, I've installed the win32 version of therion on a USB thumb drive, so that I can use it on my computer at work. This has worked fine until recently. Here is the error I get when I try to compile a map through xtherion. Error: can't read "xth(th_exit_number)"" no such element in array. Here is the contents of the log file: can't read "xth(th_exit_number)": no such element in array can't read "xth(th_exit_number)": no such element in array while executing "if {$xth(th_exit_number) == $xth(th_exit_number_last)} { set err 1 } else { set xth(th_exit_number_last) $xth(th_exit_number) }" (procedure "xth_cp_compile" line 78) invoked from within "xth_cp_compile" (procedure "xth_app_make" line 20) invoked from within "xth_app_make" (command bound to event) When I try to compile using therion directly from the command line, I get the following error: therion 0.5.2 cavern.exe - Survex 1.0.39 configuration file: thconfig reading ... done reading source files ... done preprocessing database ... done scanning centreline tree ... done searching for centerline loops ... done calculating station coordinates ... done average loop error: 2.41% processing survey data ... done calculating basic statistics ... done processing extended elevation ... done processing references ... done selecting export objects ... done processing projection plan ... done average distortion: 2.16% writing clay_plan.pdf ... The system cannot find the drive specified. therion: error -- metapost exit code -- 1 Press ENTER to exit! Any idea what might be causing it? Thanks. -- Jonny ^v^