Make sure that you switched it back to regular paper in the driver
printers and faxes folder/
right click on the printer
it will be under the paper handling tab
I would still suspect some sort of a jam or foreign object first but you say there is none. The printer does adjust some for the thickness of the paper. Its possible that the wheels expect the paper to be thicker and just dont push down enough to get it.
You can also try fanning the paper and / or using a new stack. Humidity can affect it a lot and make it stick.
did you try changing the paper type in the printer driver as i suggested ?
I am going to opt out here. If i could see it perhaps i could figure out what was happening but it may be a physical problem with the printer and I just cant think of anything else without actually looking at how its trying to pick up the paper