My Proform 785 will not unfold even after I have pulled the latch. Is there something else I need to do to unfold it?

If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

HOW TO FOLD AND UNFOLD THE ELLIPTICAL

When the elliptical is not in use, the frame can be folded out of the way. First, lift the latch under each pedal arm, and lift the pedal arms off the adjustment sleeves on the crank arms.

Next, raise the pedal arms until they touch the magnets on the upper body legs; the magnets will hold the pedal arms in place.

Then, hold the handle and lift the frame until it locks in a vertical position. To use the elliptical, first hold the handle, press the latch button, and lower the frame.

Next, pull the pedal arms off the magnets on the upper body legs.

Then, lift the latches under the pedal arms, and set the pedal arms on the adjustment sleeves on the crank arms.

Release the latches, and make sure that the pedal arms are securely connected to the adjustment sleeves.

Will be attaching a link to your manual also

http://www.sportsmith.net/images/product_support/ProForm/PFEVEL959101%20-%20PROFORM%20500%20ZLE%20ELLIPTICAL/PFEVEL95910.1-307585.pdf

see the video attached. and fix it. God bless you

http://www.youtube.com/watch?v=hHeYb6CoK4c

wATCH THIS VIDEO FOR UNFOLD TREADMILL

SINCERELY.

Some ProForm treadmills require lubrication every six months or so, depending on the usage amount. Lift the walking belt and feel on the underside of the belt. If it is dry, you should lubricate it. ProForm recommends you use 100-percent, non-petroleum silicone spray to lubricate the walking belt. Do not use wax or other lubricants, such as WD-40 or a Teflon-based spray

There is allot of weight on the "Storage Latch". You may need to push forward on the treadmill a bit, pull the black knob, then slowly let the machine unfold. Taking the weight off the "Storage Latch" will make it easier to release the latch..

Should be a knob on the storage latch that pulls out of the metal shaft. Make sure you support the walking deck with your other hand so it doesn't drop suddenly.

Before folding the treadmill, adjust the incline to the lowest position. If you do not do this, you may damage the treadmill when you fold it. Remove the key and unplug the power cord. CAUTION: You must be able to safely lift 45 lbs. (20 kg) to raise, lower, or move the treadmill.
Hold the metal frame firmly in the location shown by the arrow at the right. CAUTION: To decrease the possibility of injury, do not lift the frame by the plastic foot rails. Make sure to bend your legs and keep your back straight as you raise the frame. Raise the frame about halfway to the vertical position.
Raise the frame until the latch knob locks into the storage position. Make sure that the latch knob is locked in the storage position. To protect the floor or carpet from damage, place a mat under the treadmill. Keep the treadmill out of direct sunlight. Do not leave the treadmill in the storage position in temperatures above 85° F (30° C).
To lower follow this procedure:
Hold the upper end of the treadmill with your right hand. Pull the latch knob to the left and hold it. It may be necessary to push the frame forward as you pull the knob to the left. Pivot the frame downward and release the latch knob.
Hold the metal frame firmly with both hands and lower it to the floor. CAUTION: Do not grip only the plastic foot rails or drop the frame to the floor. Bend your legs and keep your back straight.

there is a clip latch that u need to move to pull the treadmill back down, its on the left side on top

From the owners manual:

HOW TO LOWER THE TREADMILL FOR USE

1. Hold the upper end of the treadmill with your right hand.
Pull the latch knob to the left and hold it. It may be necessary
to push the frame forward as you pull the knob to
the left. Pivot the frame downward and release the latch
knob.

2. Hold the metal frame firmly with both hands and lower
it to the floor. CAUTION: Do not grip only the plastic
foot rails or drop the frame to the floor. Bend your legs
and keep your back straight.