I do not use a laptop. I have also run the Yeti via its own direct power connection instead of USB, but that made no difference.
 

Agreed,,,, the more detailed info you provide, the easier it is to try to help you.  
 
Did you look at the users manual on page 8?   It talks about the Art not defaulting to the preferred input and you needing to do it manually.  The mention of USB Audio Codec in there tells me it's probably not ASIO driver based either..... again, not a good thing.
 
Are you powering everything down and back up again from cold starts?   Did you run the Wave Profiler successfully?  The wave profiler looks at the available inputs and lets you choose the default for fresh starts from that point on. Be sure you run it.... perhaps run it again.

Guitarhacker,
 
I am certain my device is being recognized. First of all, in the preferences, it shows up without issue. I receive no errors or messages complaining about it, and when I run the audio profiler, it finds everything and loads it up. Also, since I have disconnected every other single possible sound source to/from my computer, it is the only device still operational; I've removed the other devices in the Device Manager.
 
I assume by "Wave Profiler," you're referring to the Audio Profiler in the Preferences for Audio Devices in MC6? If so, yes...I've run that thing a million times going back and forth with the driver modes trying to fix this problem. Have run it 3 times today already, and figure I'll probably end up doing so another 5 times if its a slow day.
 
Everyone who is trying to help, please understand, my computer recognizes the USB Codec (the ART audio interface I'm using), I hear sound when not using MC6. MC6 recognizes the device. The ASIO panel recognizes it and says it is ready to go. MC6 picks it up in all driver modes, but on the individual track inputs it does not except when using WASAPI. Using the exact same configuration, I am able to use any mode in Reaper, including ASIO, without any problems. In MC6, I can do almost everything as always, except one really important thing: I can't get the actual input selector for any given track to show the device so I can record something with it except for any WASAPI. Like I mentioned before, a few weeks ago, when the problem first emerged, it was working only in MME-32, and when that crapped out for no reason, WASAPI picked up the slack it seems and started working.
 
I have all my settings correct, I'm 100% certain. I have only the one audio device to select from now, so there is no multi-device interference or confusion in the system. The mic is powered fine, and I have tried it both directly (plugging it into a wall socket via USB adaptor), and using phantom power through the ART. I hear playback just fine. I do screen capture using Camtasia sometimes, and that program picks up and records my voice even when I've got MC6 running. Everything but the damned track input selection itself is working perfectly. That's why this is utterly baffling. I want to use ASIO mode, for lower latency primarily, as I was doing for months and months and months before this came out of nowhere. Also, clearly given the bugginess I've experienced in MC6, it isn't very comforting knowing that any day now WASAPI mode could decide to take a vacation as well, leaving me absolutely no way to record anything.
 
Hope all that info helps. I'll do pretty much anything to get this figured out, so ask as many questions as you'd like and I'll be all over getting the responses out.

can you post a screen shot of the input selection window for the tracks?
 
Audio and midi.
 
Also show in a screen shot any other program that is able to see the ART and use it for input.... such as the default windows recorder or some other audio editor like Audacity.
 
Are you able to record audio from the ART into any other programs?
 
 
This is very puzzling.... to me anyway.

Might want to add a picture of the MC6 Preferences > Audio > Driver page for the recording mode being used.

Guitarhacker,
 
I tried to post a video originally showing all the details, which included the preferences, ASIO panel, sound devices, etc. Turns out I can't post links here yet. (Might be able to do screenshots here embedded or something, but I don't know.)
 
And you are correct. This problem was puzzling and maddening. But last night, good news, it was fixed.
 
Clearly the problem was with MC6. I had been posting on the Steam forums for MC6T along with this thread, and came across a developer named Seth. He passed my information onto Ryan at Cakewalk and he emailed me. They had heard of this problem ONCE before. He wasn't sure what the cause was exactly, but had something for me to try. Turns out that all persons who registered MC6 after a certain date recently received a free upgrade (full version from scratch really) to MC6T. He noted that MC6 was buggier and based on Sonar X1 technology, whereas MC6T is based on X2. Ryan wanted me to install MC6T and see if the problem cleared itself up.
 
It did!
 
Thanks a million for your efforts to help me, and to all others here who chimed in as well. This was utterly frustrating, and frankly it might never have been solved. I just know that it was very nice to finally hear a Cakewalk person admit it just might be MC6 and not my system or ASIO4ALL causing me the problem; I knew neither of those was the case.
 
Thanks again, and maybe I'll be able to help someone in the future. Is there a way to subscribe to the forums here overall, so I receive some form of notification when people post new issues? I'm sure there is, but I don't recall seeing it.

Glad to hear support got you going. There is a subscription tab in your user profile. Click the User Control Panel link at the top of the page to get to it. I believe that is what you are looking for.

Ahhhh yes.... you bumped into Seth... he used to work with Cakewalk and he referred you to Ryan who still does....
 
Basically the same as emailing tech support....  the updated.... duh....  
 
OK.. very good. Glad you got it sorted out. I'll have to remember to ask folks if they got the update.
 
Thanks for reporting on the solution.

Yeah, good old Seth. One thing though; doesn't he still work for Cakewalk? He shows as a "Developer" on the Steam Forums, and I know he worked with Ryan and some others on the latest tutorial videos they put out, 'cause he's in the credits.
 
As to getting the update, good idea to spread the word. It isn't really an update; you get the whole new package of MC6T. That's a pretty big deal and I wonder why, being subscribed to all things related to this stuff, I did not receive any notice that I had that product waiting for me, FREE, at the store? Odd.
 
Thanks again for your efforts!

Two different Seth's. Steam is a new venture for Cakewalk and the marketing communications may not be sorted out. After more than a decade, they still have trouble with marketing email. I am not sure if MC6T is an update or an upgrade. If it is free for everyone, then it is by Cakewalk's definition an update. If it is free for those who purchased within a certain time window but not for others, then it is an upgrade. Anyway, your issue is solved. On to the next.