Thx I got rid of the simplecar plugin and it did fix the problem.
Here is a question that I believe relates to this general help, my brother made a blueprint on his single player he then tried use the blueprint and rotate it so it is standing upright but it will not flip, so I joined his game made me admin and then I made a blueprint of his model then I brought out the blueprint and I was able to flip it upright but he tried again and he could not. S would you know why he is having this issue.
PS he has also checked the integrity of the game all came ok and he has also un installed and re installed the game .
Can you post a screenshot?
Also, did your brother use the right keys to rotate?