So, I've found the solution! It was entirely on me and I didn't even realize. I was using a "while" loop to do something timeline-style and it was causing the entire software to hang before it even opened a window! In case anyone wanted to know how I figured it out: Other projects launched fine. After trying a recommendation of cleaning the project and then exporting and re-importing said project and getting nowhere, I decided to try, on a whim, a blank room in front of everything. It launched fine - so it seems GM isn't to blame - so far - so I am thinking maybe it's a corrupted room? I make a duplicate of the room, place it in front - same issue. So I clear out the objects - and it runs. I check the objects - nothing unusual in the script or the first object, but I create an object that actually has a while loop. And I fail at using while loops usually, so I change it up, and it runs FINE. For those that wanna see the original post: ----------------------------------------------------- I've found myself suddenly unable to actually test run my game. Every time I attempt to launch it from within GMStudio, it just will not launch. It'll work on building the game, however, it seems to hang at the following: "C:\Users\antho\AppData\Roaming\GameMaker-Studio\Runner.exe" -game "C:\Users\antho\AppData\Local\gm_ttt_39811\gm_ttt_3532\Sphiro.win" Attempting to set gamepadcount to 12 Unable to find output device "null" defaulting to "Speakers (Realtek High Definition Audio) via DirectSound" Total memory used = 605221(0x00093c25) bytes Compile finished: 7:50:44 PM I tried finding information on this but it either leads to a "solved" thread that doesn't seem to explain what's happening and how to fix it, or questions with no answers. I didn't change anything. Last I was doing the other night was saving after editing a couple of lines of code, but nothing related to audio. EDIT: I've been finding that the audio part is an expected piece and reading it to myself a few times it seems to be unrelated. But that still begs the question as to why it's been happening out of seemingly nowhere to begin with! EDIT2: I can launch other games without any problem whatsoever. It's just a specific project, it seems.