Cannot view BLOB datatypes in Oracle10g

After a successful upgrade from Oracle8i to Oracle10g, I cannot view tables with BLOB datatypes. I'm getting the following error in SQL*PLUS upon quering the table:
SP2-0678: Column or attribute type can not be displayed by SQL*Plus
When i try to do the same thing from TOAD, I'm getting this error instead:
A Query with LOB's requires OC18 mode, but OC17 mode is used.
I have also tried to create a new table with BLOB datatype (since i thought the culprit was a broken migrated data) but I got the same error. What am I missing here????

Hy,
you never could view blobs via sqlplus
you only could use utl_raw.cast_to_varchar2 if there ist text inside your blobs.
regard
Martin

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