I do have a problem with the Mac wallet. It doesn't find any block, hence it does not work. I did try several times (different days).
Is the wallet still working?
I got the same problem with the win64bit wallet.
Please try adding nodes manually with the 'addnode' command.
On Mac, go to: Help -> Debug Window, then 'Console' tab; type
addnode "eu.bitmark.io" "add"
addnode "us.bitmark.io" "add"
addnode "jp.bitmark.io" "add"
This should get your connections going to the Bitmark P2P network