Hi Graeme, The error comes up whenever I run illumread, at the point where the instrument is selected (for example with option 1) if there is no instrument connected. I get this error: Problem signature: Problem Event Name: APPCRASH Application Name: illumread.exe Application Version: 0.0.0.0 Application Timestamp: 52eb21fd Fault Module Name: illumread.exe Fault Module Version: 0.0.0.0 Fault Module Timestamp: 52eb21fd Exception Code: c0000005 Exception Offset: 0000a35e OS Version: 6.1.7601.2.1.0.256.48 Locale ID: 6153 Additional Information 1: 0a9e Additional Information 2: 0a9e372d3b4ad19135b953a78882e789 Additional Information 3: 0a9e Additional Information 4: 0a9e372d3b4ad19135b953a78882e789 I'm running version 1.6.3 32-bit (I had a problem with one of the modules in the 64-bit version, I think it was oeminst, so I installed the 32-bit version which is fine). I'm on Windows 7 Pro SP1, 64-bit. Before I realised that it was the lack of an instrument I re-installed Argyll and then reverted back to a previous version of my system (I use Acronis True Image to take snapshots of my system). The problem was still there (even though I had run illumread several times before with no problems). I then noticed that I had not attached the instrument: I did that and illumread still crashed. I then checked to see if the Argyll driver was selected and it was not. When I selected it I was able to run illumread. Robert -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Graeme Gill Sent: 04 June 2014 07:10 To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Issue with illumread robert@xxxxxxxxxxxxxxxxxx wrote: > illumread crashes when trying to do a measurement if there is no instrument > attached or if the Argyll driver is not loaded (for an i1Pro). I can't reproduce this. If I have no instrument connected on WinXP I get: illumread -v test.sp Press 1 .. 7 1) Measure direct illuminant 2) Measure illuminant reflected from paper 3) Measure paper 4) Select another instrument, Currently 1 ( 'COM1') 5) Compute illuminant spectrum, average result with 0 previous readings & save it 6) Compute illuminant spectrum from this reading & save result 7) Exit If I try and measure something I get: '1' !!! Unknown, inappropriate or no instrument detected !!! '4' 1 = 'COM1' 2 = 'COM3' 3 = 'COM4' Select device 1 - 3: Can you be more specific about how you caused a crash ? Graeme Gill.