It sounds as though you didn't let PRE finish conforming the audio. The component recording the details of the audio file is the .cfa file usually to be found in C:\Users\user_name\AppData\Roaming\Adobe\Common\Media Cache Files.
When you next import a clip to your project check the bottom right of the PRE screen. This will show you the progress PRE is making in preparing your file for use. Resist the temptation to start work with it immediately - wait for it to finish conforming the audio.
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Yes, patience during the Conforming process should be all that is necessary. There is a little progress bar at the lower-right of the GUI, but many users miss that, if they do not know exactly where to look for it. This ARTICLE goes into more detail on the Conforming, and Indexing, process.