Per the release notes for Toad for Oracle 11.6.1 in the Known Issues section:
[Team Coding]
The 64 bit version of Toad does not provide native support for the following Version Control Providers:
- Microsoft Visual SourceSafe
- Merant Version Manager (PVCS) version 5.2/5.3/6.0
- Merant Version Manager (PVCS) version 6.6 and later
Integration with vendors who support the SCC API is dependent on the provider’s 64 bit implementation of SCC.
RESOLUTION:
Download and install the 32-bit version of Toad for Oracle and compatible 32-bit Oracle client.
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