The text of the 8/6/01 PDB has been released. This paragraph implies that the CIA and FBI are diligently working away:

The FBI is conducting approximately 70 full field investigations throughout the US that it considers Bin Ladin-related. CIA and the FBI are investigating a call to our Embassy in the UAE in May saying that a group of Bin Ladin supporters was in the US planning attacks
with explosives.

Condi and Ben Veniste agree there was no specific threat information. The information contained in this memo is quite vague and indicates that proper steps are being taken. What were they supposed to do, invade Afghanistan based on it?

Here's a digest of Condi's remarks.