In regards to overdrives, each of the hulls in the game received their own unique overdrives with their own dedicated effects {official update announcement}, which you can check out here.
As for all of the other important updates that took place since your departure, I recommend you check out the List of major updates for returning players thread.

If you've got any further questions, feel free to ask them here.

Please contact one of the RU event admins (XOM9lK or 47x) via their Forum's private messaging system.

You can download the TO Flash client from here (or here, in case you're a Mac user). Its download link is available on the Entering the game Wiki page, under the 'Entering via the official Game Client' page spoiler.

Hi.
For purchasing any of the Mk7 tank kits for crystals, you need to reach the minimum required rank of Lieutenant General. There's no other requirement other than the rank one.

Please follow the News and Announcements section to keep yourself updated.
 
Closed.

Hi, please contact the Tech Support via this form.

Hi, that occurred due to an unfortunate bug we've been having. Don't worry, however, as all of the data from your original Forum account hasn't been lost and is waiting for you.
To merge both of your duplicate accounts into a single one (the exact same one you've had prior to the Forum upgrade), please send a PM to @Maf and he'll resolve it for you.

Note for everyone: as evident from their Forum profiles, the OP can speak and understand English, so there shouldn't be an issue in them not understanding this post.

Awesome. ?

If anyone else is still experiencing this issue, please contact the Tech Support via this form, and they'll manually fix the bugged mission(s) for you.
As for the bug itself, it has already been reported to development team.
 
Closed.

Please send a PM inquiry to either one of the contest administrators, @Goges.Enze or @Mr.Kenan.

Hello, please contact the Tech Support via this form.

If you've got any complaints regarding the events, kindly contact one of the event administrators via Forum PM.

Please contact the Tech Support.

Please send a PM inquiry to @Regency, the FR newspaper manager.

Hi, that occurred due to an unfortunate bug we've been having. Don't worry, however, as all of the data from your original Forum account hasn't been lost and is waiting for you.
To merge both of your duplicate accounts into a single one (the exact same one you've had prior to the Forum upgrade), please send a PM to @Maf and he'll resolve it for you.

To an event admin, either @Goges.Enze or @Zackery459 via Forum PM.

Hi.
To unblock your clan, you will need to contact the Tech Support via this form (providing your clan name and its tag).

Please see here: I’ve been punished, what to do?

Hi!
Since your username got changed due to inactivity (see here for more info), you can change it for free of cost by contacting the Tech Support via this form.

If you want to have a private conversation, you can reach out to @Jay via Forum PM.
 
This is not the place for it.

In addition to the above-mentioned, try using the following username format when logging in: r_Username (with a prefix 'r_' infront of it)
If that also doesn't work, lastly try using r_Username0 (this time with a '0' at the end of it).
 
Let us know if that works.

Have you tried yet playing on the official HTML5 client [for Windows / for Mac]?
 
For issues with the Flash version of the game please refer to the relevant Help Site article.

No, you cannot. There's no such battle format / game mode.

Because such classified information isn't handed out, especially just like that. If you've lost an old account of yours or forgot its username, please use this form to reach out to the Tech Support.

No, unfortunately there isn't. I would suggest you try changing the function of your Delete key to another one, for which please Google / YouTube search for a guide on how to do so. Remapping your laptop's keyboard or creating a dedicated Delete function hotkey (e.g. CTRL + backspace) would be the only solution in this case.

Have you tried clearing your browser's cache?
We've also got an official HTML5 client for Mac users, which you might want to try out in case you haven't already. It should offer you better performance.