You can expect many bug fixes as well as new additions when the update on January 15th goes live, to immediately partake in the event be sure to have your accounts wagered at least 5 BTC in volume since December 15th to qualify. You won't have to do anything else, just log in after the update and you should see your bonuses credited.
What about the issue with the sidebar opening and closing spasmatically if I hover my mouse over it?
This is a problem.
It's new to me, since it is a part of the GUI dynamics.
Is there a place where I can see how far I am from the 5 BTC wagering requirements?
Unfortunately, the only way are through site: Your account tab | Statistic | Total Wager or like @shulio said just check your status from moneypot
https://www.moneypot.com/users/"username"
-Happy New Year