incompatibility with crystal reports?

For some unknown reason Crystal Reports doesn't like some of the fields
coming from a postgresql database.

CR v8 + Win32 + latest ODBC driver + postgres 7.2.1.


What is happening is it won't let me 'browse data' for a field when
selecting fields to report on, nor will it let me 'group by' any text fields
- only integer.

The "text as longvarchar" ODBC driver option seems to make no difference.


Thanks

Andrew