I know that there are multiple threads about old 14-50 adapters melting, but I didn't see a report of one of the replacement adapters melting, so I thought I'd post my recent experience. Over the last couple of weeks, I noticed a few mornings that my car was stopping short of its scheduled charge (90%, scheduled to start in the wee hours). One time, it reduced the charging rate to 30A and a couple of times the ring around the charge port was red when I unplugged in the morning. Perhaps foolishly, I thought I had not inserted the charge cable completely and I didn't think much of it. I had been using my original adapter and UMC from January 2013. Then my replacement 14-50 adapter arrived in the mail. I went to swap it out and discovered that the old 14-50 was quite melted: I called Tesla Service the next morning and sent them a picture of the melted adapter. They said that this was a problem the new adapter was meant to address, so hopefully the new adapter wouldn't have this problem. To be "100% safe", they asked me to send a picture of UMC connector. I had used the new adapter to charge the night before for the first time. When I checked, there was indeed some melting on the UMC. There was also some melting on the new gray 14-50 adapter, which had only been used for a couple of hours of charging the night before: A Tesla Service valet brought a new UMC and adapter to my house a couple of hours later and I have successfully charged a couple of times since then. I don't claim to have a thorough understanding of the adapter change, nor of electrical issues generally. Presumably, this was an issue that my UMC developed 16 months into use. However, I thought it was noteworthy that the new 14-50 adapter did not eliminate the possibility of melting.