after buying the version 1.0 of LR, I let the software do it's thing during the night, converting 20,000+ images from shoots to folders.
In the morning I discovered it messed up the folder structure, but the strange thing is: in 'finder application' everything still fits. My system is still intact: Lighroom/managed photos/year/shoot name / files
But in LR from the years only 2003 and 2004 seem intact. 2005, 2006 and 2007 have disappeared and it just shows a very long list of shoots.

I want to fix it, but how??! Do I drag and drop in the finder application and does LR recognises the changes, or do I have to change this from within LR? And how?

Every suggestion is well appreciated!

Regards,

Click on + in folders to add new folder.
Navigate to the top level folder. Choose it.

Hit return.
If Lightroom attempts import, hit cancel.

LR will now show the subfolders for the top level folder.
Repeat for each top level folder.

Thanks Sean, that worked perfect!