Yes, definitely a software bug, constantly reproducible when the notes of a Bm7b5 chord are played simultaneously with fingers, but not with a pick.
I use a Peterson strobe tuner to intonate my guitar, usually between the 3rd fret and 15th fret.
I been building and playing guitars for over 45 years.
Yes, no guitar is perfectly in tune, but you can tune small areas very accurately, usually specifically for studio recording.
No fretted instrument can have exact note intonation.
Still not ok with you because you don’t seem to recognise or listen to what I’m saying: looking at your screenshot and mine, your guitar is out of tune, not mine.
This is why I can play correctly your chord , you can not.
No criticism here, just a statement of fact.
I don’t understand why you want to find a bug in this software and not in your tuning and playing.
Tune yourself correctly, place your fingers correctly, play with your fingers on the other hand correctly, you’ll end up playing this chord correctly like I do.
I repeat once again, playing in real time with Midi Guitar requires extreme precision, which is difficult to achieve compared to playing without conversion, and certain chords like the one in question will be difficult to play perfectly in a sequence of other chords.
As much as I can play this chord by playing it alone and repeating it several times before it starts to sound right, I can’t play it in the middle of a chord progression. Here is the bug: in my fingers, not in the software, even though I’ve never built a guitar (I don’t see what that has to do with anything) and even though I’ve been playing guitar for over 60 years 
I think we should stop this debate, which is completely sterile, except that it has enabled me to learn how to play the Bm7b5 chord correctly, which I didn’t know before. 
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Unfortunately, this Bm7b5 and other tritone chord bugs is what is stopping some very experienced Jazz guitar players from using this software for chordal usage.
I’ll say no more than this, it’s definitely a Bug in the MG2 software…
The issue relates to playing chords by plucking multiple strings simultaneously.
Have you ever tested MidiGuitar3 HEX with Hex Pickup and experienced the same problems?
With HEX this is not an issue.
@ElektroFuzz, I also assumed that the single string recognition in MG3HEX is not a problem due to the single string pickups.
The big advantage of MG3 Standard is that I can plug and play with any guitar right away, but the missing link is the lack of single-string recognition. In my opinion, this is where the biggest evolutionary pressure is with MG3.
If @JamO manages to get a stable single string recognition in MG3 Standard via the software, the wall will come down for the most guitar players and MG3 Standard can do everything that only MG3 Hex can do at the moment.
Well, with the forthcoming hex-detection feature, you plug your 13-pin guitar cable into your USB hex device and MG3 Hex grabs the pre-selected ports and transmits MIDI virtually from the moment it’s instantiated. Doesn’t get much easier.
Considering the inherent “limitations” of the standard MG3 tracker, this is about as simple as it gets.
@Vaultnaemsae, yes it’s true, it could hardly be easier at the moment … if you have the necessary Hex devices and have installed a Hex pickup on every single guitar.
But that was precisely @JamO’s mission, to make this special technology superfluous and accessible to a much larger number of guitar players around the world for every guitar with a magnetic pickup.
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JamO has superpowers but cannot defy physics at least until we lack quantum computers at home 
I have the ability to use MG3HEX as I am (still) an owner of a GP-10 but my main device is a VG99 that does not work with MG3HEX so I usually use plain MG3.
I use Jazz Chords and I can play a Bm7b5 chord in the following shape :
Shape of The Bm7b5 Chord: Chord Farm.
With no problems when I pick the chord with the fingers. If I strum (and E are included) I got some strangeness some time. If I strum too fast or unclean I can have some problems as the OP reported. However for the majority of times I got a good chord.
I think reporting problems it’s very important to make MG3 (if possible) better than what it is. I also think that as guitarists we need to be super precise when reporting problems. Guitars can obtain chords in many shapes and it’s important, I guess to explain which shape a chord is failing and if strummed or picked. Strummed continuously vs strummed once. That makes a world of difference for the software I think. So let’s help @JamO to make MG3 even better!
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I fixed the post title. Anybody who overtly calls it a “bug” is being disingenuous or is simply uninformed. The phenomenon under discussion is a reality of the technology. I’m probably not going to win any friends with this post…oh well.
Fact: MIDI Guitar has always excelled at monophonic tracking. Nothing else much in the software domain will come
close to what it can do. As a “jazz” guitarist, one might have a lot of fun playing monophonically, just like all your favorite horn players. It’s not like we’re all in the Count Basie Orchestra’s guitar chair.
The nature of the audio analysis technology that pulls your guitar signal apart and reinterprets it as MIDI dictates that if you want to play certain kinds of voicings and if the musical scenario demands that the notes be played/executed simultaneously, you will require a hex solution. This is hardly a great mystery of pitch-to-MIDI tech. Hex systems have been around for decades.
MG3 Hex has put to rest any issue that any legit harmonic beast of a guitarist has every faced when dabbling with pitch-to-MIDI conversion. By using separate instances (as those in the know have been doing since at least 2015 with MG2 + BOSS hex systems) there is no longer any issue of “inharmonic” hallucinations.
If you’re not invested in your art enough to get yourself a hex system and a MIDI Guitar 3 Hex license nobody can help you.
Don’t like hex pickups and 13-pin cables? Why not use your creative energy to find ways to work with the technology rather than trying to push a marshmallow into a money box?
There are new musical gestures to be found and good players making excellent musical use of both MIDI Guitar 2 and 3.
I just played a bunch of “complex” chords through the hex tracker and it ate them all. It’s really unbelievable what the combo of BOSS hardware and Jam Origin software can do. MG3 Hex is the real deal.
I’ve used virtually all the systems that are practically accessible in existence and MG3 wins. It’s not a bug!
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It’s a bug, because MG3 can’t process simultaneous single notes in a chord correctly.
If I’m playing a Bm7b5 chord with simultaneous notes (plucking with fingers) I want to hear a Bm7b5 chord. I don’t want to hear a Bb as the bass note and no B note, which is what MGS processes.
This makes MG3 unusable for Jazz comping. (So, I’ve stopped using it.)
MG3 sounds best with monophonic instruments, so I mostly use trumpet and sax.