1) The crash is happening when the document is closed but is still being edited. You can fix this by switching back to the pan tool before closing the document and before saving it (if you want the current edit to be saved). (The online demo will be changed to do this.) To check if the form is being edited and switch back to the pan tool it so, use code along the lines of the following:
if( ![[pdfViewCtrl tool]
isMemberOfClass:[PanTool class]] ) {
[pdfViewCtrl setTool:[[PanTool alloc]
initWithPDFViewCtrl:pdfViewCtrl]];
}
2) The drop down menu will show any files you have added via iTunes file sharing (as well as those included in the app bundle). You can see this in the source code in RootViewController.m, selector - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath.