NyxWGA,*Player Experience Supervisor, has given the following statement to those who’ve been getting bugs since 9.15:
“Hey folks!
After the update, we’ve got some issues that are pretty frustrating for folks. We’re working with the dev team to get permanent fixes for you as soon as possible. In the meantime, we wanted to provide a few suggestions that may assist some players until the permanent fixes arrive.
We know that these things have helped *some* folks, but these are not guaranteed to work for everyone.

  • Clear out your preferences folder
    • To do this Press the Windows key + R, and type %appdata%\wargaming.net. Then Delete the “worldoftanks” folder.

  • Disable replays
  • Run the game in safe mode
  • For graphical issues, be sure your graphics card drivers are updated.

We are also continuing to gather information, so if you have any info that you feel would assist us, you may post it in this thread. If you can, please include reproduction steps and screenshots of any issues you encounter.
Please keep your posts as clear and constructive as possible. This thread is specifically for you to share information that may assist us. Posts that are not created to share information or to ask clarifying questions will be deleted.
Be assured that we are working diligently to get these issues addressed. I apologize for the inconvenience and thank you for your patience!”
Hope it helps.