Please try
https://github.com/project-bitmark/bitmark/releases/tag/v0.9.5.1Although it's tagged as a pre-release, it's actually quite stable and, more importantly, it has updated and correct DNS Seeder nodes which should get you a real-time list of active nodes, so you don't have to use 'addnode' and your node will join the Bitmark network right away.
My wallet immediately found nodes. Check firewall
Yeah I figure it's something else than the Bitmark wallet itself. This is really strange, I have dozens of Qt-wallets form different cryptos installed on my computer and I haven't had similar problems with any of them. I just add an exception for the corresponding EnterCoinName-qt.exe in the firewall and the start syncing. I even tried installing and running Bitmark Core on my separate gaming computer - same results, no peer and not syncing even one block. It's completely cut off the BTM network.
It's most probably is the firewall, since I'm using the same security software on both computers. Are there any other files other than "bitmark-qt.exe" that should be added to the firewall exceptions list?