Last night I wrote a post about my experience developing my first extension for Opera, and everything went pretty smooth.
Today, I faced a new problem, I changed my code because it was breaking down the internal working of the websites (e.g. the mighty Youtube, and MSDN login.)
The bugs seem to be:
"A package with this name already exists. Please change the name or upgrade the existing package."
Apparently, there seems to be a bug that doesn't delete files from the server, yet shows me that I successfully deleted the extension.
I posted a new topic on dev.opera.com forums, and hopefully this will be fixed soon.