Hoi Sam 
I found the problem - see my posts below 
It was (as usual) my fault ^^
Grüezi zrugg!
Merlin
I have one plane which has this “issue”, and I cannot start the plane with my Logitech switch panel. Despite what the switch physically does, it does not hold the starter key down. The plane virtual cockpit requires the starter be held for a few seconds so I have to start it with the mouse.
Let’s try that. I use the mouse wheel to roll the key.
OK. All this time complaining about an ‘operator error’.
Roll to ‘both’, then LMB click and hold. Started everytime!
Now to try and see if a hot restart, will be as big a pain in the ■■■ as RL is.
Thanks to all.
Glad its working for you.
Happy flights!
Bill
LHC
I’ve had exactly the same issue, was wondering what I was doing wrong. Gotta try this when I am back on the ground, fingers crossed.
Now, if they will fix the horometer and the pilot’s / co-pilot’s position, this will be a sweet plane, faster than the Mooney.
Btw, I don’t know if you guys are aware, but there is a mod to make the Trinidad more realistic:
Moulinsart Trinidad TB-21 GT Plus (requires the LHC Trinidad TB-21 GT) » Microsoft Flight Simulator
Unfortunately, your method doesn’t seem to be working for me. I did notice though, that it seems to be much easier to start up the engine when I choose to use “legacy” mode instead of “lock” mode for cockpit interaction.
This is the only plane where I have this problem 
Update 6 and the hotfix installed…
First flight, had an issue with the annunciator test switch was not working. Had to restart, (for other reasons), and still had this issue.
Also the VOR’s not working, could ID 430 audio, 530 visual and DME, but no radials and no needle movement. Plane would follow HDG bug and a GPS setting, but not VOR nav.
Have only tried with this aircraft. Any others having issues?
I’m also having a starting problem, but of a different type. No matter what i try, i cannot move the fuel control knob. I have tried clicking on every part of it including both ends, tried the mouse wheel, and moving the mouse side to side and up and down. Nothing happens. Any suggestions what I’m missing?
I have been having the same issue. Been that was since last patch for me.
The mouse indicator stays as a hand finger, never switches to circle arrow.
That sounds like an old bug. If so this can be reset by being up one of the top menu pop-ups, like the VFR map. Click on the map, then close it, and it should reset the cursor.
only one problem i had is fuel switcher was reversed and i thought it on, but it was off, so i just turn it opposite direction and start without any problems, try to start immediately after fuel pump is on, or use it 2 sec, no more if no start 1sec more, then start, then you can try don’t give a mixture on starting then prop spinning give mixture, i had nothing to do yesterday, and install dcs, take mustang and she won’t start until i starting with closed mixture, then when prop spin turn mixture to run and drym-bym-bym run from ramp to airborne:) with subject i just don’t remember any tricks except fuel tanks selector position confusion… as remember just standard simulator procedure, except really need some fuel pump i guess, but not sure 
On the real aircraft engine is started with mixture idle cut-off and fuel pump off.
afaik different aircraft use different positions of fuel pump switcher and or mixture lever by default, and some of them use those positions as mandatory and other can be started with both positions mixture or and fuel pump… in msfs some models move mixture forward by itself when you start them
p.s. some time one aircraft can be started without fuel pump from one tank, but can not with another, just because from some tank fuel will not go to the engine(s) without pump, like p-38 wing’s tanks… so, different fuel system need different moves of pilot, for engine start/stay work
Jup, thats why I’m saying. You can’t start the real TB-20 with fuel pump on and mixture full rich.
well, i need brain surgery lol, you said “the real” so that’s was about subject… (mommy, when i will understand english?!)
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Developer be aware. The altimeter doesn’t work since AAU1 update
Thanks