I’m new to QSPICE and trying to set up an isolated converter, and couldn’t for the life of me figure out why my simulation wasn’t even remotely working. The answer was I had managed to flip the (4 coil) transformer symbol horizontally and, since the symbol is symmetric, I couldn’t tell.
It would be great if there was some kind of visual marker on the symbol for which coil is the primary, since all of the parameters are relative to that one. A little P next to the dot, something like that.