I carefully followed a thread on similar problem. I created a special format called "Apartment" and assigned to category "Apartment exchange". In creating this format I copied from general format, and unchecked the boxes for ACTIVE and REQUIRED from AD1-AD5. I went to place an ad to the category "Apartment exchange", but there was no change on the "Place ad" page. \
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Please help.
Then you have something in your settings. If you copied the format, then added it to the category, it should display the fields when you select that category on the post ad page, nothing else.
Frankly, I have not understood the purpose of classes Ad1-Ad2 and Ads1-Ads2. I did not find any documentation on custom field manager. I think I will need some customisation.