I'm not seeing text that I've set as bold as actually looking bold when editing posts (either initially or editing an existing post). They post correctly, but until the post goes live it doesn't appear bold; it does show the little "B" icon as highlighted if I've got the cursor within the bolded text.

Using Windows 8.1. Tried on both Firefox (37.0.1) and IE11 (11.0.9600.17690), same results.