Yes, they are on thicker card stock this year which causes issues for some printers.
You may want to check out the information in the VBS Discussion Group on Facebook: https://www.facebook.com/groups/AnswersVBS/permalink/1341740319207915/?match=bmFtZSB0YWdzLHRhZ3MsbmFtZQ%3D%3D
Here's some information from Stacia, our main VBS person about the postcards and nametags:
"No good deed goes unpunished. ;) We wanted to offer something that had the nice glossy finish and was sturdier to give the postcards a better look and feel. We thought we had tested them to make sure they printed ok but apparently they don't in many machines. Office supply stores seem to be able to print them ok (they are laser printer friendly still). Or, you can print labels and affix those to the postcards. Or there's always hand-addressing them. We will return to the way they were in previous years for Time Lab. :)"
Customer support service by UserEcho