Since updating to r115 and r116 I have been unable to preview my game for some reason. I am using Firefox to preview my game usually.
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Please see how to report bugs. Can you explain more about the problem? We cannot help with only this much information.
sorry for the late reply, but R118 fixed the issue anyway, meaning it must have been the changes that you made to the checks on the browsers when going into preview that fixed it, anyway, thanks :)