Try running the CS Cleaner Tool to remove old remnants of the Burrito Preview, and then see if that enables you to activate your new FB 4.5 Serial Number afterwards. You can find the latest Cleaner here:
If you still have any trouble activating after that, please provide details about what happens when you enter the new SN. Also, you might find the solution in the Knowledge Base article here:
You could also send us your log files, described in the KB article, if the workarounds described in that article don't resolve the problem easily.
For using the Playbook SDK, are you using RIM's April 19th update (v1.0.1) described here:
RIM has some Getting Started info here, if you haven't tried these already:
If you're still seeing compile errors after using those Guides, please let us know the details.
Neither actually helped to solve the problem.
But what i did is installed the released version of Flash Builder 4.5 Premium ( must have had a prerelease version of some sort ) and then used the following hack to develop for BlackBerry PlayBook.
Glad that worked - Jason rocks!
Did your SN start working too after installing the Released version of FB 4.5?
Yes the SN worked perfectly in FB 4.5 Premium.