The trainer isn't a problem. They
vast amounts of money had an influence on the stock market. That is completely disabled now for MP.
Online doen't start anymore if you have mods installed, just take the filed out when you start online.
The hackers took over. Online is basically unplayable. 5 hackers on every server, spawning money and cars to a point where it breaks the server.
[Edited by madatcheats, 7/12/2015 5:51:57 AM]
Yeah noticed that too, I despise online cheaters they ruined many good titles for me.