Crystal Reports return Error 534: Error Detected By Database DLL

Hi,

I'm using Crystal reports 8.0 with Sybase 7.0 on Win 2K/ NT system using ODBC connection.
When I run two reports simaltaneously it returns "Erro 534: Error Detected by Database DLL"
This error does not occur all the time. I've tried ODBC tracing, I found some errors:

 Cons            1184-1340      EXIT  SQLSetConnectAttr  with return code -1 (SQL_ERROR)
            SQLHDBC             01D71590
            SQLINTEGER                1041 <unknown>
            SQLPOINTER          [Unknown attribute 1041]
            SQLINTEGER                  -3

            DIAG [S1C00] [Sybase][ODBC Driver]Driver not capable (0)

Cons            1184-1340      EXIT  SQLColumnsW  with return code -1 (SQL_ERROR)
            HSTMT               01D71E38
            WCHAR *             0x01D716C8 [       7] "v40"
            SWORD                        7
            WCHAR *             0x01D716E8 [       3] "d"
            SWORD                        3
            WCHAR *             0x01D715F8 [      21] "tblRMarPat"
            SWORD                       21
            WCHAR *             0x00000000
            SWORD                        0

Thanks for your time and effort,
GatorGal