You can find other programs on the Internet that perform the same task as Idle Master. And although I cannot recommend them for use, since I have not researched their security, you can try to investigate the matter yourself.

You're welcome. Have a wonderful day, too.

P.S.
For the sake of experiment purity, if you haven't done so already, you may delete the Idle Master configuration data (located here: %USERPROFILE%\AppData\Local\IdleMasterExtended) and re-authenticate in your browser to obtain new sign-in data for use in IdleMaster.

You can find other programs on the Internet that perform the same task as Idle Master. And although I cannot recommend them for use, since I have not researched their security, you can try to investigate the matter yourself.

You're welcome. Have a wonderful day, too.

That's the least we can do. I may lay my hands on the current version of the project to make it more foolproof. Won't happen soon though.

Have you tried running steam-idle.exe directly and noticed if any drops occur?

Does the Steam badge page indicate the same amount of such?

Seems like the issue indeed, or, at least, a part of it, as it can't be run via IM's GUI.

Update:
Not quite fully the issue, though. Some of the demos I've tried don't have pages for themselves either.

Just tested with two demos — works just as fine. Which game are you trying to run?

What are you referring to?

Which version are you using?

Ничего, карточки кончились. Больше из тех игр, что имеются на аккаунте, ничего не выпадет.