I have had no problem up until now and no idea of how to correct it. I have a MAC OSX. When I bring a photo into PS CS4 and hit the save as I am no longer able to choose JPEG as it is not one of the choices. I did notice that on the SAVE ON screen by the format drop down the word LAYERS is not available to click on and I am sure this is what needs to corrected. Another user on my MAC does not have this problem with Bridge and the word Layers is checked. Your help is appreciated, thank you!!!
Make sure the mode is 8 bits
In PS go to the menu Image/ Mode and see if there is a checkmark in front of the 16 bit, if so click on 8 bit and it will convert back to 8 bit and you should be able to save as jpeg.
OOPS!!!!!! Never mind, when I first opened a photo it was already in JPEG, and when I tried again it was Tiff and I had to change to 8 bits. thank you all soooo much!!!!! Such knowledgeable people here!!!! I am so appreciative...