Don't yet know who else has tested it or what steps they have followed so it might not be but it does look like the actual values are entirely server side so it might be that the developers patched the game which deliberately or inadvertently stopped the option from working or that when the trainer was developed it wasn't noticed.
If others want to try testing it and post what steps they took just so we can be sure, no need to waste the time of the CH team until we know it doesn't work. If after testing by a few of us we can confidently say it doesn't work then we can put in a request for a trainer update but if it is indeed all stored server side then all the CH team will be able to do is remove that option from the trainer.
I don't know if anyone has tried gaining coins by using the trainer option for XP. You get a load of blue coins when you level up so that might be a way around it.
Ah ok. So it isn't an insane grind like other games?
You can send a screenshot to the developers and ask them why you can't buy anything with the coins you have.
You can also ask them why the game forces you to buy more coins to buy things in a game you already paid for.
you can also, which happens a lot, wait for the game to probably drop it's server, then the coins will work. But that might not be until the developers have milked every dollar out of you by then.
If we need to remove the coins option because the developers have moved all the checks for this online on their server to milk more money out of you, then let me know.
From what I understand, all currency values seems to be server-side. So not much can be done about it.