I have seen the 502 error sometimes in the evening when updation is in progress, otherwise logging in is not a problem. For me the problems happen after logging in when wrong figures are shown. This happens mostly in the 60 day challenge reports. Even at this moment, when the ledger for the day is updated, the 60-day challenge is showing some weird figure. I guess it will be updated later in the evening, so I give it till morning to check again. But it should not happen. When updation is in progress, the software should give such a message "updation in progress, please check later".