CNRT.....to specifically answer your question.......No, never seen this occur personally or to another in 30 years of training.In fact, I have to chuckle because these supposed jaw and forehead problems, and the mythical "GH gut" were blamed on steroid use back in the 70's when widespread access to synthetic tesosterone, dbol, and anadrol first became available. Then it was called "steroid gut"......Lee Haney's physique was criticized for it, and Ferigno's forehead was blamed on steroids.
So far, the best science available still states that acromeglia is a disease...probably genetic....that is not caused by the injection of exogenous GH. Normal folks who do not have the disease possess a triple loop feedback defense mechanism that allows the body to neutalize the effects of excess HGH. In fact, those of us who use GH for extended periods spend a lot of time and effort trying to overcome some of these bodily defenses so as to get the best results from our doses. (supplementation with insulin, insulin growth factors, T3, etc.)
I've personally used GH for many years, and the only effects I can report are good.......I'm bigger, leaner, and feel better than I should at age 53. Again, though, moderation in all things is usually a smart policy.