I get a pop-up that said something like r6025 virtual function call. When you click okay the console window is closed.
Sounds like something's corrupted. Did you try... reinstalling Blockland?
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I mean, I doubt it's your mod that is directly causing the issue, assuming it's just a standard add-on that doesn't modify Blockland.exe or it's dll's. Duly, you would know if you were making some function call every hour on the hour. Are there any add-ons you're using that could conceivably be calling some function on such a specific time schedule?
stuff, idk. If I was smarter, I'd tell you how to capture the system calls around the time the error occurs. But it's been awhile since I've done anything like that, and I was stuff at it then. The fact that the error occurs directly on the hour implies that Windows is initiating the function call that leads to the error; maybe some routine process diagnostics or something. Just a guess.