Updated Linux wallet (2.2.2.0)

The official repository sources, https://github.com/niitassin/XNAPos, compile correctly for Linux so I'd suggest you pull them and build the new wallet. As the OP mentioned, this update fixed Proof of Stake and made a few minor improvements to the GUI.

If can't build binaries yourself, you can use these: DeOxyRibose_qt_headless_2.2.2.0.7z.

Remember to scan for viruses! It's not worth it to trust other people's binaries with your money.

Blockchain (Block 2500)
If you shot past block 2500 in the slew of updates to the wallet, here is a link to the blockchain at block 2500 (just before PoS started): xna_blockchain_2500.zip.

Nodes
In case you can't sync, here are a few confirmed nodes:

Edit:
If you are having issues with blocks that never confirm, they are orphaned! Open the Debug Window and type repairwallet to retrieve the coins for proper staking.

Edit 2:
Current Block as of 2015-05-10 00:23:07 UTC:
2994
Hash: a26fccb2bc462c33f1f466a2a9c72a62e5127fcd9d44d8ad0d738a1ab9783ccc
You can check the hash for block 2994 in your wallet's Block Explorer tab - they should match.