Hello,
We're using in our company the PlSQL Developer for years. From our perspective, the currently most annoying problem is the slowness of application. It's like every newer version is slower than previous. It's mostly about changing connection, closting windows, starting application, lags casually occured.
I found some of our developers start using version 8(!) back. Using Oracle Developer is like you switch to ferrari from tractor
Let's vote for the "top ten" problems; In my opinion all current reported issues are "local", for me the slowness is THE ONE.
Best regards,
David