I called Palm Tech support regarding this issue today. After spending more than 1 hour doing multiple hard resets the blank alert issue was corrected. As I started to re-install my previous phone favorites, blazer bookmarks, and saved preferences. The problem sprung up again. I was able to narrow down which file was corrupted (saved preferences). I did one more hard reset and did not reinstall my saved preferences file. The alerts now work properly.

I hope this helps.