I have been using application loader since one year. But for last few months I have problems with the application loader.
When I click on the send button in the Ap
The problem is that Application Loader uses Java, and Java does not inherit the Mac's proxy settings. The solution is to specify the proxy information to Java.
If you are on a Mac OS pre-10.7.5 (more or less) just look for the Java Preferences application via the spotlight. If not, this SO question specifies how to do so.