Strange New Problem In Sonar Professional

I'm throwing this one out there in hopes that someone can puzzle this one out for me. A couple months ago, rather suddenly, a new issue came up. When I record an audio track I can see a  waveform and hear the audio as it records. When I hit stop, however, the waveform disappears leaving a flatline and no audio, or it's replaced by a loud and very offensive screeching squelch. This happens on any pair of inputs, and when using my POD X3 Live on inputs 7/8, or Blue Tube on inputs 3/4. Playback is otherwise normal except on the affected audio track. I can record MIDI with no problem.
I can record via the Scarlett Solo USB route. I am able to record and play back audio normally in Studio One 
My sound card is a Delta 1010LT. I don't recall which Sonar update I was using when the problem occurred, but it has persisted through at least a couple of updates.
I originally thought my sound card was the problem, but given that I can play and record normally in Studio one seems to rule that out. I have been over and over the settings to see if there had been some subtle change, but I can find nothing amiss. This just seems to happen in Sonar.
I will buy a Twinkie for the person that can figure this one out. You guys have always had great input (no pun intended), so I'm confident you can help me solve this one.
Thank you in advance.

I would agree that your being able to see the waveform and being able to hear the audio during recording would rule out your soundcard, etc. as being the source of the problem. (I'm assuming here that you are monitoring audio via Sonar and not by some zero latency/direct monitoring feature of your sound card). That the problem occurs after you stop recording suggests that you are correct that it is something in the way you have Sonar set-up. Have you tried setting up a very simple project? Maybe a single audio track with the input set to your 1010 and the track output set to "none", and nothing else in the project, just to see whether you can successfully capture the audio. Assuming you have been through all of the relevant audio set-up options, perhaps the old "delete aud.ini" thing still has some effect this far into the 21st Century.
 
BTW, what is a Twinkie? 

What is a Twinkie??? I'm stunned! A Twinkie is a small oblong shaped cake formerly made by Hostess. Maybe they don't have them in your neck of the woods.
I will try your suggestion at first opportunity. Thank you very much for your reply.

Hi. As mentioned by the others here, I would use only one Audio Interface at the time. This might be your issue. Use one at the time, and use ASIO driver mode (where possible). 
All the best.

Delete everything from the Picture Cache folder. These are all the pictures of the computed wave forms.
They will all be recreated upon file loads.
 
That should fix you up.

Oh, and one last clarification: ASIO never works well on my system, so I use WDM which as always served me well.
 

dana martin
ChristopherM, this is for you:

Well, thanks for that! The taste must be very special, because its looks are not obviously those of a gustatory delight.