for the progress bar change:
<script type="text/javascript">
WADFP_SetProgressToForm('submissions', 'submissions_ProgressMessageWrapper', WADFP_Theme_Options['ExtendingWheel:Slate']);
</script>
to:
<script type="text/javascript">
WADFP_SetProgressToForm('submissions_ProgressWrapper', 'submissions_ProgressMessageWrapper', WADFP_Theme_Options['ExtendingWheel:Slate']);
</script>
If you are saving multiple copies of the file, or have the upload set to resize an image, it can easily use up the 128mb memory limit, the gd processor that is used to re-size images is very memory intensive.
try upping the memory limit to 256mb
