Power Builder 12.5.2 with Oracle Client 64Bit

Hi all

I have installed Sysbase 12.5.2. The Installation goes fine without any errors.

Now, I would like connect with a Oracle Database 11g 64 Bit, the Oracle Client is also 64 Bit.
a) The PB – Database Profile – is ORA Oracle
b) Server, Login ID(Oracle User) are correct

But, I can't connect to the Database with PB (with sqlplus, Toad etc. form Oracle everything works fine)
The error Message is: Oracle Library OCI.DLL could not be loaded

Trace Log:
/*---------------------------------------------------*/
/* 08.11.2014 14:09 */
/*---------------------------------------------------*/
(30ffcb8): DIALOG CONNECT TO TRACE ORA ORACLE:
(30ffcb8): LOGID=safir
(30ffcb8): SERVER=PROD(DBI_DIALOG_CONNECT) (257003.963 MS / 257003.963 MS)
(30ffcb8): *** ERROR 999 ***(rc -1)
(30ffcb8): SHUTDOWN DATABASE INTERFACE:(DBI_SHUTDOWN_INTERFACE) (0.002 MS / 257003.965 MS)

Question: Is PB 11.5.2 not usable with Oracle Client 64 Bit or what's the problem with the connection?

thanks for feedback

regards

Kurt