I have Inventor 2012. When I work on a new model, I have the Yellow and Green dots when sketching.
However if I work on an older model, the dots do not appear. I have everything on. See attachments. Not sure what else to check.
Quick key to show Constraints is F8, just for reference.... F9 turns them off.
Actually didn't mean the grips. I meant the yellow dot that follows the cursor and the green dot that shows up when your cursor is on an end point, midpoint or intersection point.
OP's first pic shows those already set.
Just a guess since you mentioned older files, is it possible these files have not been fully migrated or saved up to the latest version you are using?
Turns out it is my part that is causing the problem. After leaving Inventor and going back into it, things went back to normal. However the more I worked with the part, it became progressivly unstable. Not sure why part is doing that.
if possible, post your file/s here for others to look over.
I don't have 2012 myself, still on 2011 but maybe someone else can take a peek into your model and prehaps find something odd in there.