When you scale a model, e.g. 105% and then do some rotation to try and get it to fit on the build plate, then want to change the scale to 106% you go back to the scale window and it shows the current scale as 100%. Pressing reset does not change this.
This is a big deal, because if you have several parts to print you need to scale them each to the same amount, and adding 1% after 106% is not the same as scaling to 107%.
The only way around this is to delete the model and reload it.