In my experience it is NOT necessary to modify either the UBB file locking or the UBB cookie subroutines to install this hack if you are using a recent UBB release (eg 5.47b or above).
These UBB routines already have the fixes included (which is why the UBB code does not match the instructions in the hack). They include the same fix using different code, so to replace them is to regress the InfoPop code rewrite. No point in doing that.
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