I noticed that in 4.2.1, the checkbox labels now inherited a block display and this caused it to shove the whole label to the next line. This wasn't the same behavior as 4.2.0. 4.1.1.png4.2.1.png
I was able to get the boxLabel to behave like it once did in 4.2.0 by "adding" (actually overriding) the boxLabelCls. This css can be placed in a custom.css file instead of trying to search and replace it in the ext.css.