This is not seems to be an error with your form fields/scripting; rather this could happen cos of your Render/Submit service you have chosen..
Verify that they are running properly (through adminui) and consider memory limitations of your server
The submit function is called after the form is submitted and data are passed to the workspace-server. That data are input parameters of the submit function and you can validate them, make computations and so on. Unfortunatelly in my case this sometime never happen. Form is unable to submit the data. And if data are not submitted, no submit function is called.
For that reasons I do think there is no problem in render / submit function.
Make sure your render service configuration is using Custom Configuration -> targeturl for the target url parameter.
Also you can hard code http://<server>:<port>/workspace-server/submit on the submit button to test to make sure it's not something with the form.
You don't need the all the process fields to be added tp your form. The only thing you need is a submit button.
I have just installed sp3..
without any sp LC 8.2 was ok, but after that sp3 , when i complete a task in workspace, it seems to be completed,
but process does not go the next step. In adminui, i see task is task is completed but operation still in 'RUNNING' status.