Dear all,
after this "not-possible-multiple-times-same-category", I decided to delete all categories and try to read-in again.
Deleting the categories was no problem, I only kept the new IM5-cats.
Then I made first a backup of this 8,5 GB IM5-database: it was done in 11 min.
I restarted the now category-cleaned IM5-db. It allways started after 1 min. with a white screen for ca. 3min., then short the IM5-screen and again a white screen for another 5 min.
I started now again importing my IM36-category-exported file ( with check-sum), it take 1h 2min to finish.
Jep, all categories are in again! But now the best thing: I closed IM5 and started with new imported cats, again I got a white screen for 1 min, but then IM5 was living!
Also switching between categories is very quick! Before it was with several white screen inbetween and a reding-in of the categories (shown in the lower left corner)
At moment I'm happy!
Next step is to make first a new backup to keep this situation.
Regards
Gerd
P.S. With the qick-start I was too quick ... after starting IM 3.6 to check category-content and then starting IM 5, it was the same as before: first the IM-start-screen, then 4 min. white screen, then short the UI-screen and again for 5 min the white screen ... overall it takes on my system 10 min to start IM5 with 144.000 pictures.
I think, the quick start before has something to do with the Windows-memory-cache.