Can't import IIF file

Hello, I am trying to import IIF files using the Import Bank Statement function. This has always worked fine in the past, but now it always says “The file you are trying to import is invalid”. I am trying to import data from Quickbooks Payroll. The same IIF file opens up fine in other programs. I also downloaded a few sample IIF files from the internet, and none of them will import either, giving the same message. Is something currently broken in Manager regarding IIF files?

If you send me this IIF file to lubos@manager.io I can have a look why it doesn’t import.