Hi,
Il you trie to submit a form to a sharepoint library and you get a read-only
error it because you probably lock you on form by retreiving the form to a
specific address but you trie to submit to another address.
You probably change the URL tou use from https and http or from servername
and localhost.
This information is store in the processing header and the form and does not
change whae you reopen the form.
Check your processing to make sure it's fit with the URL you use to request
the file.