Issue with uploading files from frontend
Have you tried enabling devMode in the craft/config/general.php file? You can do this by adding 'devMode' =&gt; true to the array. You should then be able to see an error on submission.

If this fails to output anything then it could be that your input requires square brackets adding to the name, e.g. name="useruploads[]"

Even though you have limited the field to 1 upload, it may still be expecting an array to be posted to it.