Is a million too much for a criteria in Process Author?

I´m using Process Author and wanted to send out an email to the Supervisor when a new Opportunity for the Amount of 50m or more is created. The logic is simply:

I am using the operator "greater than or equal." And then an email is sent to the Supervisor to encourage him/her to give some compliments. Well, I didnt get any mail so this wasn´t working.

I then starting putting in smaller number for the Amount criteria. This works (email is sent) if I put  1, 1000 or even 500.000 in the Amount. But as soon as I put 1.000.000 or more (without the dots), the mail is not sent. Does anyone know what I am doing wrong?

Oh and then I started testing using the operator "greater than" and it worked with 999.999 just as the one above but when I use a 7 digit number (for example 1.000.000) it stops working.

Could this be a bug? Nahh, probably not.

Once again, thanks all you guys for you help

KGM