We have an issue when we modify and upload our Tridion Building Blocks.
When using the template builder everything is working correctly but when using preview or doing a publish we get an error message.
For preview, the message is: object not set to an instance of an object?
For publish, we see the message "The number of render failures has exceeded its specified failure limit of 0" and "There was an error generating the xml document"
The workaround we have now is to restart all the services, com objects and app pools on the cms server. After that preview and publishing are working again.
Tridion version is 2011 without service packs.
Has someone seen a similar behavior and what was the definitive solution so we don't have to restart every time?