well, as like most of you, i have relatively the same problem. from what ive heard its all because its installer 4 is a beta version. but it makes no sense to me why some people running the same firmware as I (2.0) can download things with no problems and no crashing. when i get to the home page, where it lists the "most popular" and try do click on an app, Installer crashes and goes back to home screen. when I go to "categories" and try to download an apps, i get the following errors: "Error-Bad URL" "error- operation could not be completed. (com.apptap.installer error 3) and "error-failed script command on line 2:ChangeMode". im positive i did the installation correctly and everything. im in my regular wi-fi area, where cydia works great. and im almost positive all the permissions are set correctly, but who knows. hope someones got some ideas, thanks for reading the rant
