Oracle 11g, PLSQL 12, can't connect

[srcypher]

I've tried all the tips/tricks to get 11g 64 bit setup and talking with v12. Everything behaves like I don't have 64 oracle installed, but my IT departments says it is; environment variables are set along with paths correctly.

No matter what I try, I can't get the oracle home & path to show in the program, and neither ezconnect nor the TNSNAMES.ORA method allows me to connect.

I get blank on the TNSNAMES pulldown, and I get the below on 64 bit with ezconnect.
Can anyone else shed light on options?

Could not initialize
found oci.dll
load library returns 0

 

[Marco Kalter]

This may indicate that you are using a 32 bit Oracle Client.

The 64 bit version of PL/SQL Developer requires a 64 bit version of the Oracle Client.