My name is blush and I'm one of the technical staff for the studio. One of the recent changes to the game does involve generating a new tab to launch the game in a full screen mode, which generates a flash object for your browser to use. Depending on certain conditions met within the browser and it's extensions, it may fail to launch properly.
Firstly, I would like to make sure that you are using the most recent version of your web browser whether it be Firefox, Opera or Chrome. Internet Explorer and Edge are not environments that support our game. Other non mainstream browsers do not have support either, such as Maxathon, Vivaldi or Rockmelt.
Lastly, I would HIGHLY encourage you to completely flush your browser's cache, cookies, offline data and any other flash object data that may be on your computer. Programs such as bleachbit and CCleaner are the most efficient way of doing this without touching saved passwords and form information you may want to keep.
Once all of this is done, feel free to either respond to my post here or PM me directly!