Yeah, a lot of the JavaScript and CSS has changed for WeBWorK 2.16. Largely my fault, but hopefully the changes are an improvement. So if you have any of the 2.15 files that have changed in your browser cache, these sort of things will happen.
WeBWorK Main Forum
Display width of questions in Hmwk Sets Editor becomes narrow after upgrade to WW 2.16
This forum has a limit to the number of forum postings you can make in a given time period - this is currently set at 10 posting(s) in 1 day