I've just come across yet another bug this since this morning's Photoshop update.
After importing a smart object into my document, I transformed it to scale it down and the size % was showing 0. When I changed it, it gave me the error "A value between 0.00% and 0.00% is required. Closest value inserted."
There are different ways to resize or transform smart object if the % thing didn't work due to bug. Here is the thing you can do:
Besides i don't find any bug in my update.
I had an issue with text size earlier, and after deleting my preferences file in an attempt to solve it - it seems to have fixed both problems.