Normal, idling 2 different games would cause the drop rate to halve for those games. Idling more than 1 instance of a game would be pointless... Unless the games are on different accounts in which case you'd be better off using Archi's Steam Farm.

Archi's steam farm is regularly updated, you could use that instead.

Otherwise the top suspect would be win10 and it being run as win7 and MS dot net version or corruption problem, what version MS .net framework you running? You could try to repair it.

Also rebooting windows (full shutdown) often fixes glitches.

It's been suggested to freshly unzip idle master to a folder on the desktop, might be something to do with folder permissions. Could try that.

Or delete appdata as per pinned discussion.

And check user level of steam and idle master - they should both run at the same privilege level. (see pinned discussio for troubleshooting).

Have you restarted steam and idle master, logged both out and back in? (steam 1st)

See:
http://psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/133257636766989675/

copy the whole folder and duplicate the appdata folder contents

引用自 Strelaonline：

... I think best is idling every game solo, is it?

That's what I do just to avoid the risk of idling games for 2 hours and then they still drop cards slowly afterwards.

The 2 hour option is for people who have refunded game(s) and don't get card drops in the 1st 2 hours.

I'd guess that you just copy IdleMaster.exe.config to the new installed folder, overwriting the default one.

Idle master reads your badge page, linked here, it looks for 'card drops remaining'
http://psteamcommunity.yuanyoumao.com/my/badges

Steam gives the cards(not idle master), Steam only gives half a badge set number of cards.
http://psteamcommunity.yuanyoumao.com/tradingcards/faq

You need to buy the rest or trade for them:
http://psteamcommunity.yuanyoumao.com/market/

Free-to-play games do not drop cards unless you spend lots of $€£ on in-game purchases or DLCs

Solve by close idle master, exit steam, restart steam.

See:
http://psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/133258593384696763/