Hi,
I have a problem that I didn’t have before, don’t know where it comes from.
When I want to move an object I created (like stairs for ex) and I want to move them and place them in the right spot in ‘the house’, I have a problem when I’m almost there: I can not align it to the wall for ex, then when I want to move it just a bit more, like cm’s, it doesn’t react immediately but then jumps a whole meter, when I try to move it back a bit, it jumps right away to the first spot.
I had the same problem when pushing out a shape, couldn’t do it either for just a cm or so, it kept going right away to a meter and back, but there I could fix it by adding the dimensions manually; that doesn’t seem to work for moving an object.
Why is this? It’s making me crazy… 
There are templates with length snapping actived out there, look at the SU preferences window if this is the case for your model.
Thank you, I found it! 
Just to follow on from Cotty’s post, you can adjust the length snapping in
Window/Model Info/Units
You can change your setting there and then save as a template an it will always open that way.
Posting together it seems.
Okay, nów I got it (thought I resolved it but nope ); thank you both!