Did you set up a separate data folder and separate program install for the Beta?
Load up the previous version, if you still have that.
Open a pick list in Content Manager.
Highlight the assets.
Right-click and choose view assets in a new window.
Select the list of KUIDS at the top part of the window.
Press CTRL+C to copy.
Paste this to a text file.
Repeat this for all your pick lists. When pasting into the text file, put in spaces after each list of KUIDs.
In your Beta-version:
In Content Manager, click on Install and add in Asset-KUID.
This will display put in an empty space to type in KUIDs, but we will paste them in here instead.
In your text file you created previously, select the first list of KUIDs.
Paste this into the Asset-KUID space mentioned.
This will list only those kuids.
Highlight this list, choose, add to Pick list.
Repeat this for your remaining KUIDs you saved in the text file.
Why you lost your pick lists, I don't know because mine came over fine.