Replying to Liddelljohn
I received my e-visa on 26th October, so have recent experience of using the website. After commencing the application on-line, I, too, experienced some difficulty re-logging in, finally submitting the visa, and making the payment. To address these problems, I think I logged out, cleared my cookies, and logged back in. I think I had to attempt this twice, but after a couple of tries I managed to get the system to work correctly. As you are finding, the website isn't straight forward. I suggest you keep trying and wish you good luck.
Replying to Dirk Z
I am pretty certain that you can not apply for a e visa in advance of 60 days before the trip will commence. If the arrival date is more than 60 days away this would explain the message that your application will be 're-considered again within 60 days from your arrival date'.
As others have commented, it may be that you need to supply a scan of an actual bank statement rather than a screenshot.
I hope these comments help.