[Ifeffit] Artemis error - xdi is not writable (0.9.21, Windows 8)

Dear All, I've encountered a problem in Artemis 0.9.21 (x64 running under Win 8.1 Pro x64) when I try and load a project file to which I've previously saved changes using this version of Artemis. When double clicking the file to open it the programme begins to open as normal, until it reaches "importing paths" - at which point it simply closes. The log file (attached) shows an error that "xdifile is not writable, no setter defined at...". Opening files saved in older versions of Artemis seems fine though. I've attached a log file and a problematic project file. Regards, Ian