Since some time, I was experiencing problems with iPowerweb. It started with erratic favicons, then PHP errors in plain HTML pages. Then, it turned out that their offer to host several domains on one plan was not useable (not to say it turned out to be a lie). And then, out of the blue, some PHP applications on my site were broken, and I couldn’t access FTP any more.
It seems iPowerweb was a great company, once. For now, I can just advise you to get away as soon as possible.