First of all, are you using the PHP accelerator? If so, you will need to get the Who's Online version that is PHP compliant.
I have installed the Sticky threads successfully on UBB 6.1.0.3. Be sure you have correct file permissions on the the files, and make sure you have hacked every file correctly.
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Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.
