I am having the same problem as @roblaplante. I run the trainer, it crashes. Run again and get the Mono Error. Tried every suggestion to no avail. I am almost sure that the problem lies with the QMods installer. It's probably modifying the mono.dll file (or something) to make its mods work, as I started having these issues after installing it.
(most) Mods are ment to alter the game files, so that could be a reason to brake a trainer yea, since its made for the base game. if the trainer makers have to test the trainer on a game with every mod possible it would take a lifetime. so i suggest you use mods that only add files instead of change files.