You may receive this message when you attempt to upload a change set:
"This change set requires the (API version number) or later platform version.
One or more of the listed organizations is on a version incompatible with this change set. You can only select an organization for upload that is running the required version or later."
The target org is selected the first time a user uploads a change set. Based on the target org, Salesforce sets the version of the change set (current release vs next release) to match the target org's version. Once this is done, Salesforce requires that subsequent uploads of that change set be targeted to other orgs on the same version, or a later (newer) version, used in the original upload.
Examples:
Example 1:
Example 2:
Workaround for Example 2:
000385976

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