Try using this form template:

{!! Form::open(array('url' => '/postDev' , 'files' => true ,'enctype'   =>  'multipart/form-data' )) !!}
    {!! Form::text('title', null , ['class' => "form-input" ] ) !!
    {!! Form::file('image1','',array('id'=>'','class'=>'')) !!}
    {!! Form::submit('Send', array('class' => 'btn-right')); !!}
{!! Form::close() !!}

Thanks for your reply, and sorry for my late answer.

I used a more drastic approach, I reinstalled Laravel in a new folder and copied views, controller configfiles etc (the project isn't bigger than it's possible yet). Don't know what the problem was but it did work after that.

I'm glad it worked after all :)