I'm getting System.TypeException: DML operation INSERT not allowed on on object that I have created.

The error occurs when running many of the tests with asUser with a profile of "Standard User".

The object  Deployment Status is In Development, and all of the fields are Editable except

CreatedBy, LastModifiedBy, formula fields, and Name which is of type Auto Number

I've had it working before but did a retreive, changed test code and deploy using ant.

I've had similar problem in the past when performing an UPDATE but managed to fix it.

None of the fields are required. Some fields are Lookups but those are not set and not required either.

There are no master-detail types.

I am running eclipse 3.5.2 on a Linux system and am trying to install the Force IDE, but it fails with
It appears to download OK, but it ends with the message
An error occurred while collecting items to be installed
  session context was:(profile=PlatformProfile, phase=org.eclipse.equinox.internal.provisional.p2.engine.phases.Collect, operand=, action=).
  Problems downloading artifact: osgi.bundle,com.salesforce.ide.api,24.0.0.201202291629.
    MD5 hash is not as expected. Expected: 7251ab037ae632a5a9835c7c07210451 and found 852d5ea0c1a4561a84f6c34c48afdb8b.
  Problems downloading artifact: osgi.bundle,com.salesforce.ide.core,24.0.0.201202291629.
    MD5 hash is not as expected. Expected: 44db36699ca7fdd38917fced4e63c3b3 and found 162b23271f1ac6b482640c9a29f166e3.
  Problems downloading artifact: osgi.bundle,com.salesforce.ide.documentation,24.0.0.201202291629.
    MD5 hash is not as expected. Expected: 6d87eb2e76e7e19f7b709682e5272dfc and found 4827ffac1acc67d6c0d796500bc7708d.

I am using the site url http://www.adnsandbox.com/tools/ide/install/ as described in the documentation.

The main contact link is down.  It returns with the following message.

This is the mail system at host web1.developerforce.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<feedback-developerforce@salesforce.com> (expanded from
    <feedback@developerforce.com>): host
    salesforce.com.s8a1.psmtp.com[64.18.7.10] said: 550 5.1.1 User unknown (in
    reply to RCPT TO command)

Reporting-MTA: dns; web1.developerforce.com
X-Postfix-Queue-ID: 76E4D29C0001
X-Postfix-Sender: rfc822; (xxxxxxxxxremoved)
Arrival-Date: Tue,  1 May 2012 09:43:07 -0500 (CDT)

Final-Recipient: rfc822; feedback-developerforce@salesforce.com
Original-Recipient: rfc822;feedback@developerforce.com
Action: failed
Status: 5.1.1
Remote-MTA: dns; salesforce.com.s8a1.psmtp.com
Diagnostic-Code: smtp; 550 5.1.1 User unknown

I'm getting System.TypeException: DML operation INSERT not allowed on on object that I have created.

The error occurs when running many of the tests with asUser with a profile of "Standard User".

The object  Deployment Status is In Development, and all of the fields are Editable except

CreatedBy, LastModifiedBy, formula fields, and Name which is of type Auto Number

I've had it working before but did a retreive, changed test code and deploy using ant.

I've had similar problem in the past when performing an UPDATE but managed to fix it.

None of the fields are required. Some fields are Lookups but those are not set and not required either.

There are no master-detail types.