Yea, the old model worked with sigmoid at the end. Like I said, everything is similiar but instead of projecting onto 2 neurons in the fully connected last layer, i project on 4 neurons in the new model .
I am using the old model to track the mouse, then I crop the image (where the mouse is around the centre now), I use this cropped image as input for the model I am building atm. Gonna try with the loaded weights, did not think of that thx.