Try alt tabbing at the main screen to the trainer, hitting f1, then clicking "single player" and hitting "continue campaign". Seemed to work with me when I was having the same issue.
I have done that, created a personal trainer-cleaner batch file.
I found this issue too one workaround I found was to close both game and trainer then reload trainer but don't activate it reload game then when you are waiting for your mission/level to load activate the trainer that seems to sort that issue out most times
for the most stability when playing campaign its best to quit after each level close and reload both game and trainer
I hope this helps some of you
I have said this already but I don't feel you guys get enough appreciation so again @pwizard and the CH team thank you for your hard work the trainer is great
We just LOVE having our very hard work called "worthless". Really motivates us to add more options and update the trainer on a WEEKEND.
Please note that trainer production and posting has slowed due to work on our new All-in-One app. Consider contributing to our Kickstarter campaign to keep trainer production and posting at the normal rate.
[Edited by moderator PWizard, 10/29/2021 10:04:40 PM]