I replied to your support ticket with details about the fix. For the sake of common knowledge, I'll post it here as well.
If your module is based on Content and has problems updating items (saving them for a second time after they are created), the most probable reason is incorrect binding of Lstring properties in your module definitions. If you have a line like the following:
and here Content is a property of your data model of type Lstring, then you should substitute it with this:
DataFieldName = displayMode == FieldDisplayMode.Write ?
This should fix the problem. For the latest fixes and approaches on building modules, you can always refer to the sample modules in the Sitefinity SDK. Do not assume they stay the same. We change them with fixes and updates after each release.
All the best,
the Telerik team
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