What is a CueSheet file type? Like, what’s it for, and why does it appear in AO? Can it be converted to flac? Does it need to be converted? I mean, it plays OK.
When you rip a CD you have a choice of making it in one track for the whole album
or as many tracks that album have, separated (most people do that)…
if you do it in one track for the whole album, you need a cuesheet file to make that one track
looks like a regular separated track album… in other word, if you don’t have a CueSheet with an album that was done in one track, you will get your CD of 42 mins in one song… not cool the find the third song in that album 
if your CD was done regularly like 10 songs in that album separated, you don’t need that CueSheet file… you can trash it, same as the log file…
Some like to keep them, you can…
By the way… Origin and Studio always had some troubles, still, i think with CueSheet, so if you use them, better put them elsewhere from the CD folder they were in if you want to keep them…
CueSheet are not music file… can’t be converted to music or FLAC, they are just an index of the CD you ripped… or took somewhere else, that had that in it 
Thanks for that…actually these are albums with separate tracks (FLAC) in JRiver. When they copy over into AO, they show up as CueSheet (still separate tracks), but the file type has changed to ‘CueSheet’).
Is there a cuesheet in that folder of those CDs?
Just remove them restart your computer and Audirvana and it should be good after, i think 
You on a Mac or PC?
I’m on a PC. I am certainly going to try deleting the cue file (I do notice that there is one for the CDs in question). As soon as I can free up my computer I will then restart, as you suggest…and tell you what happens.
Uh oh…deleting the cue file changed the whole CD into one file: so basically separation into tracks has disappeared. Not good.
So, you see that in that CD folder, there was one flac file, then with it inside a cuesheet file…
it appears then in the software as separated tracks because of the cuesheet file inside the folder…
they were not separated tracks in the CD folder for sure…
Yes, exactly, one flac file with the tracks separated by the cuesheet. Therefore, the cuesheet file is kind of essential for CDs like that.
just put that CD with one track on JRiver and convert it to flac… no harm (the file will stay as is),
then just use that new CD folder in your Hard drive and delete the one track CD folder…
Funny you should mention this. In JRiver, the CDs in question already show up as flac files with proper track listing. It is only when they are added to AO that they show up as cuesheet (with proper track listing). Removing the cuesheet converts them to a single track in both AO and JRMC. So, essentially, back to my original question…what’s with the cuesheet file type? Seems to display and work just like flac albums, but I was curious. When something shows up different, I always want to know what it is.
But what is interesting is this: all the files of a given CD show up as flac in JRMC and as cuesheet in AO. When I ‘convert format’ in JRMC and restart AO, they appear as flac! Nor sure what this proves, but following your advice did something!