I looked in the inactive widgets area...all my custom-made widgets under "text" widgets are gone. Luckily, I had copied all my html to a notepad document a while back..just in case I ever had to retrieve them again.
I copied them from the notepad doc and pasted them into new "Text" widgets. Most of my little pics and buttons are there, but a few of the newest ones I made are gone. NOT in the inactive widgets area, I'm sorry to say.
I only wish there had been some kind of heads up about the switch. Not cool.