Were your clients using Application Password Protection in FlashFXP?  
 
I am assuming they weren't using it. 
 
You could always run FlashFXP from a portable media device such as a U3 smart drive or USB drive. 
 
Oh and I almost forgot you can leave the site password blank and you'll be prompted for the password each time you connect to the server.
		 
		
		
		
		
		
		
		
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