Image Upload problems

Hi can some body help what little hair I have left is being pulled out at a rapid rate... I have two queries.

1). I have a stack of "upload image" on Update pages working fine but on one page it just doesn't upload an image, i've followed the tutorial instructions to the letter even copied and pasted working copy off another page yet still no joy.

2) Another Puzzler, I have locally a page that is taking data from a temporary holding table when I select insert it is inserting the data into the live website table at the same time i'm uploading picture and the picture name is going into the live database. All is working great, I've uploaded the php file to the live server and all the information inserts into the live table except the image name and no image is also uploaded, what is going on, i've been struggling for the last 8 hours on the above 2 issuse and it's doing my nut, any help gratefully recieved. Mike