I recall seeing a thread somewhere on here about what to do if you reach a plateau, but I can't remember where I saw it now.
A couple ideas for you are;
1, Raise your caloric intake for a day and then jump back down. This may shock your system back into it. Or you could try getting a zigzag of calories throughout the week. If you want to stay around 1700 calories try doing something like;
S: 1900 M: 1500 T:1700 W: 1800 R: 1600 F: 1600 S: 1800
This way you're averaging 1700 calories a day, but your body isn't getting used to one certain amount. Or maybe 1700 5 days and then a 1500 and a 1900 the other 2 days.
2, Switch up your exercise routine. If you find you're doing the same thing every day you exercise change it up. Try something you haven't done before. Do different things on different days.
3, If you aren't eating snacks but instead eating just 2-3 meals per day then make your meals a little smaller and add in a few snacks.
4, Rest. Yes, taking a break from exercising can really help.
Maybe someone else can add some more ideas, or knows where that thread is about plateaus, but hopefully those few help you out some.
To lose 10% of my current body weight!