How are you getting the data for your report? Are you just linking tables together? Using a command or stored proc?
If you're linking tables together, you should be able to create a "SQL Expression" (look for this in the field explorer) that will convert the blob to a string as part of the query, before the data gets to Crystal. SQL Expressions can be any SQL that you might use to define a field in a select statement in a query. The syntax will be different for different databases.
What type of database are you connecting to and what version of Crystal are you using?
-Dell
A computer only does what you actually told it to do - not what you thought you told it to do.