"Convert Null Database Values to Default" is disabled/greyed out for CR2008

We have a new install of Crystal Reports 2008 12.0.0.683.
I can set the Options to check "Convert Null Database Values to Default", but I created a new report on crdb_odbc.dll to SQL Server BEFORE setting this Option on. I need to check that option on in Report Options, but it is disabled, and I have no idea why - never seen anything like that happen (and cannot find any reference to it in the Forum threads). Another thing I noticed in the Database Expert is the indexed fields do not have a coloured identifier. Not sure if that is related.
However, now in Options if have checked Convert Null Database Values to Default, and when I create a new report, it remains checked in Report Options and enabled. I just don't really want to have to create my report from scratch again.
Any thoughts? Thanks!
Do I need a service pack, and if so, where do I download that from?

Hi Angela,
Please try the following :
1. File menu>>Report Options.
2. Uncheck the check box "Perform Grouping on Server".
3. Now check whether "Convert Null Database Values to Default" is enabled or not.
Regards
Manish Tiwari

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