... got email answer with promising solution, but didn't work for me yet :
Hi there...have you seen this?... Many recent versions of Windows (including Windows 7) will not allow for basic authentication (cleartext) over non-SSL connections. This restriction makes security sense, however, the user interface simply fails without explaining why. You can override this security with a registry change: http://support.microsoft.com/kb/841215
To work around this behavior, enable Basic authentication on the client computer. To do this, add the
registry entry to the following registry subkey, and then set the entry to a non-zero value:
To enable Basic authentication on the client computer, follow these steps:
1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate and then click the following registry key:
4. On the Edit menu, point to New, and then click DWORD Value.
5. Type UseBasicAuth, and then press ENTER.
6. On the Edit menu, click Modify.
7. In the Value data box, type 1, and then click OK.
Note Basic authentication is enabled if the
registry entry is set to a non-zero value. Basic authentication is disabled if the
registry entry is not present or if the
registry entry is set to 0 (zero).
8. Exit Registry Editor, and then restart the computer.
The funny thing is that I had it working after I installed BitKinex (without using BitKinex) in 2 of the attempts, but then never again.