"Race Canceled" while trying to load a race

[DetonatorAgent]

My AC Content Manager keeps crashing when loading a race.
I'm trying offline, and it works on a fresh install for a race or two before not working with any combination of car or map, modded or vanilla. None of the separate launchers work in settings and I can't seem to reverse it.

AC will launch just fine through the normal launcher via steam, and will even load with my modded cars.

Any ideas?

 

[Jempy]

As it seems to work for one or two races, I only see one possible reason for your problem ... an antivirus deleting or quarantining one or some Content Manager file.
It may happen any time with some antivirus suite .... I had this happening with Fanaleds one working for months and suddenly not working any longer.
Have a look in your security history ... you might find the reason there and even a needed CM file in its quarantine.

NB: even excluded from analysis, a single update may bring the problem again.