Sudden inability to upload to website via SmartFTP

Hi, I'm the new Webmaster (From Hell...) for sonomavalleychorale.org. Up until now, I've successfully been able to do direct uploads to the site using SmartFTP. The prior webmaster instructed me to use Frontpage to make changes to pages and then click and drag to SmartFTP to update the site. All worked well until this last week. Now I get messages like "/" is current directory or NOOP Command Okay. But no changes take place. I did have massive MS XP updates installed by BGates and company but everything else seems to work... The web site host suggested I not use SmarFTP and just publish directly from Frontpage. Did it and lost some major portions of my site. Anyone out there have a clue???

Yeh, I'm new to SmartFTP and a basic backyard webmaster trying to volunteer to help my singing groupl.

THX

GC