SQL-Developer: cant open the program

So I asked Jeff Smith and he gave me the answer: You have to go to the Application Data directory, Roaming Profiles, SQL Developer folder. Find the subfolder with the SQL Developer version number you’re using in the directory name, and try renaming or deleting it.

In my case it was: C:\Users\myname\AppData\Roaming\SQL Developer\system4.0.2.15.21

Jeff Smith's Website

The solution to this issue on stratup would appear to be centre around the proxy settings for your SQL Developer installation. Setting the proxy to use 'No Proxy' seems to override the username and password prompt at startup.

To configure this follow Tools > Preferences > Web Browser and Proxy > Proxy Settings and select the No proxy radio.

When you restart you should no longer be asked for a username and password.