I have the original Oblivion loaded, Shivering Isles patch and the updated CS (latest release). On loading, the CS will only show SI stuff as an exclamation mark. I recall I had this problem a long while ago and it has reappeared since I reloaded the game etc. There was something I had to change in the .ini file that fixed it. Can anyone help?

Try adding the SI BSA archives to the construction set's INI file. Look for the correct key under the [Archives] section.

Yep, that rings a bell. Its just getting the correct syntax. Where will I find the archives stuff?