Hi Jenny thanks for the reply, I have already tried updating to the latest version as I was still on 1.2.11. I will try going back to 20 and see what happens. Footleg, you may have something with the permissions theory. Running as admin but something does not look right. I will get advice from bloke at work on Monday as I always seem to cock permissions up when changing. Thanks. ________________________________________ From: therion-bounces@speleo.sk [therion-bounces@speleo.sk] On Behalf Of Jenny Black [jenelopy@gmail.com] Sent: Sunday, September 20, 2015 10:22 PM To: List for Therion users Subject: Re: [Therion] Can't Open Cavern Log File For Input Hi Nick, Are your different machines running the same version of survex? I get that error too, but only when I am running the latest version of survex (1.2.23), if I go back to 1.2.20 then therion works fine. (This is also on windows 7). Thanks, Jenny _______________________________________________ Therion mailing list Therion@speleo.sk http://mailman.speleo.sk/mailman/listinfo/therion