Same here. I'v had my Garmin for a little over a month and the only thing it ever records is "longest run." I have tuned off longest run, and tuned on all the other milestones but doesn't record anything. When i select "browse activities" it says it didn't find any results and to try again. Not sure if i'm doing something wrong or it's the website not working or what. Very frustrating. And it seems a lot of people are having this problem and not a peep from Garmin about it. I've been using other websites that keep personal records. I may stop using the Garmin connect altogether.
Same for me. It keeps telling me it has successfully sent the records but the file doesn't change. I've tried both the new and old GC and also deleted the 'Records.fit' file (Edge 510) to see if it will create it - it doesn't. I've never seen it work.
I had this problem over the weekend, and as has been said in the thread. It says that it has synced when it clearly has not.
I fixed the problem and got my records uploaded to my watch, by switching from Modern View to Classic View. It just refused to do anything in the new Modern View.