Site didn't allow contributions immediately at 16.00. So don't know how some sent instantly - anyway it all went so fast...
Contribution button was working right away, had no troubles.
Only sending to the ETH address was a bit of a hassle, too many transactions for ETH to handle.
But that's a scalability problem, not caused by Tokencard but by ETH.
How did you try to send them? I didn't have that issue at all, I sent and confirmed in the first minute via Mist.
Some people came through at the first attempt, some didn't. When a block is full, it's full
Just like waiting for the subway "yeah, well, I got in"... well... others didn't haha.