Thanks for the reply;

I should add that the igc file validates

At 13:34 07 August 2019, Dan Daly wrote:
SNIP
You might want to look at the Approval Document at
http://www.ukiws.demon.co.uk/GFAC/igc_approved_frs.pdf ; in particular,
para A5 talks about declarations.

I don't see a paragraph A5. Please let me know if this was the correct
link.

What version Colibri firmware do you have (you see it in .IGC file)
HFRFWFIRMWAREVERSION:1.9
HFRHWHARDWAREVERSION:2.3
HFFTYFRTYPE:LXNAVIGATION,LX_Colibri_II

What version LXe software?
Tried the latest on the site: 3.5.0.1 May 18, 2009
In trying to create the file, there isn't a "save" button, only a "send"
button, which responds, "No response from Instrument" That's no surprise
because the manual says an SD card is required.

What analysis software do you run (StrePla, SeeYou, other?)
See-You Version 3.95 (Build 2010-04-01) (I can read the C records as
described with a text editor) See-you displays what the file says.

Where in the world are you?
Southern Ontario, Canada

:-) Thanks!