I wasn't using any user created presets, just the included FB ones. I encountered additional problems which led me to start with a "clean" site. I did encounter problems with the one (long) form again, but in the end everything is fine again except for the file type form element problem I have encountered. I have posted a separate thread on it as to not confuse it with this thread.
BTW, the more I use FB, the more I like it although it is very slow on my computer (a Pentium 4).
Thanks for your support.