I'm sorry to hear that - have you contacted your HUD office to gather all of the appropriate documents. To be FHA approved, you have to meet many guidelines. There are stiuplations on the number of rental units in the complex and there are also rules on how much reserve you have and if there are any financial problems (back payment of condo fees, etc). These are just a few, but I know with lots of foreclosures it can cause problems.
Good luck - it will certainly help attract more buyers if you get yourselves back on the list. This is becoming a common problem in the condo world.