I think the library has not finished indexing.

Indexing only starts when you go to the search and start a search and will keep going until you stop Poser. Next time you start Poser it will only resume indexing after you go to the Search tab and search for something again.

If you have a large runtime of a large set of runtimes, it may take a while for the indexing to finish.

Easiest is to go to the search tab, start a search and check that indexing has started (Top right will have a blinking orange dot) and then leave poser open and running over night If you have extremely large runtimes (mine is around 1 TB), it will take longer.

You can track what it is indexing in the log window. Open it to see where it is

Once it has been indexed, searching is pretty fast