I would first replace the battery in your themometer to see if that helps. Plus get a second one to compare the temps too. I use a refridge/freezer themometer inside the water wigger to test mine. Plus the one from flukers inside I clear the high/low temps daily on my test runs to see if I need...
I would check to see if the water line has come undone it maybe filling the bottom of the tray instead of the little area right under the styrofoam ball. I filled mine using a 16 oz water bottle and only had to top it off about every 3 days. I would get a couple towels and set your eggs in it...
Oh and here is the place I ordered all her plates and stuff from.
http://www.celebrateexpress.com/celebration/Refine.aspx?iRec=16&pageID=1&TabID=0&N=0&search=horse
I did this one for my daughter for her birthday. You don't need a special pan or anything.
http://www.coolest-birthday-cakes.com/horse-cake.html#horse06
How long have you had your incubator? If it's fairly new I would call them to see about a repair on it. Might be defective. Have you tried letting it run dry and see what the humidity runs at.
I have to say I have the best vet. He is so nice and the girls that work for him are even nicer. When my pup got hurt and I had to take him in they told me to leave him and they would call me as soon as they knew anything. They called to tell me he need surgery and that they would do it later...
I think my favorite toy when I ws young was a "Close N' Play" record player. I found a neat website for retro toys you might find interesting.
http://www.feelingretro.com/toys/Misc-Toys/close-n-play-phonograph.php
Oh and waking up on sunday to homemade biscuits & gravy, bacon,eggs the whole...