Probably something in your StarterGui that’s causing an obstruction of view on your screen. It could also be a backdoor in one of your plugins or server-scripts if that doesn’t fix it.
If you used free models at all in your map or game, check them for viruses. You can use the explorer search feature to search by class names like: script, localscript, modulescript to make it easier.
Does the character load automatically? If not, there is your problem. I’ve had that a couple of times off and nothing GUI related loaded. Otherwise, check the output for errors if there are none try preloading your content. That’s all I pretty much have to say. I would also like to hear other people’s thoughts but you’re not giving us a lot to work with.