Weird, everything worked OTA - couldn't load anything via Desktop manager as someone pointed out - one needs to install the OS - This is why I need new BB's more often...my 8703 is ancient!
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Vincent L
Sync your Contacts/Calendar/Notes/Tasks wirelessly from your PC to BB - http://www.thinkpost.net
OK I just had this exact problem coming from my 8830 to my 8330. I had Desktop 4.3.015 installed and could not install any of my 3rd party applications using the app loader. I downloaded the newest 4.3 Desktop Manager, installed and rebooted and it now is version 4.3.017 (Nov 12, 2007) and the loader works properly, as before.