I almost thought this was a duplicate, because we just had a nearly identical post a day or two ago. Here was my response:
"Every time I have seen a similar complaint, the cause has been destroyed engines (usually due to improper starting procedure). Check the engine health bars on the upper right of each engine visualizer page. If they are at 100%, then we can troubleshoot further. A video or screenshots might help at that stage."
If that's not the problem, let me know and we will troubleshoot together.