The big ones;

The roll unintentionally changes between loading and saving if not set manually in the workshop for each build - also negative numbers can turn positive even if set to negative.

Thrust and pitch can fluctuate on aircraft between loading. A plane that pitches perfectly and does a 100 kph on 100% thrust can for some reason go bananas and only do 50 kph on 100% the next flight and not pitch at all, for a glorius nosedive into the ground.

Aircraft with landing gear wobble like crazy when put down on the ground, It seems it happens to craft when they are about 3 kg in weight and on any kind of ground (concrete or grass).

It is nearly impossible to land a turbofan plane, even with correct glideslope as even landing on 10% throttle rips the plane apart, no difference to concrete or grass.

Encountering crash when entering workshop with a running aircraft in hand. (Turbofan plane, Sandbox, entering through door in workshop, not via menu.) 1/10 chance for a glorius crash.


The small ones:

Turbofan has a tendency to attach the wrong way - small but annoying thing.

Center of mass indicator can jump to the side of an aircraft in the workshop even when all parts are perfectly placed in line. Internal parts are also lined up perfectly.

Centering parts such as tailfins is very hard in the workshop - even with angle snap, as it starts to wobble around when on centerline. It is hard to correct this with the rotate/offset tool as the misalignment sometimes is so subtle that it is very hard to see.

Double-decker planes seem not to be loaded correctly as the game only seems to take into account wings attached directly to fuselage and not connected with balsa sprues.

Cannons cannot be rotated, and thus if you place them underbelly the gunsight will lower its pipper so low that you cannot see it in cockpit mode. -Minor but annoying.

Otherwise the game is enjoyable and I like it, but I think at least the "big" bugs on the list have to be fixed.