I suggest you read the forum guidelines. You've added two unrelated posts to an old thread, and the forum guidelines tell you not to do that. I'm short of time otherwise I'd split them up - but please don't do this as it makes things very confusing.
For your previous post, this is because you've passed 0 as the cross number (the third argument to cross). If you do this, it returns a list of all the crossing points. If you want the first, pass 1; if you want the last, pass -1. You must have had multiple crossing points.
For this one, I've no idea what a "webform" is, but assuming you are trying to save the waveforms, then the grf format actually saves the references to the waveforms - not the waveform data itself. You didn't say which version you're using (see the forum guidelines again), so hard to advise you - there are ways of exporting the data into a new database, but it's not that obvious precisely what you were trying to do or if it stands any chance of working in the version you're using.