I've upgraded to wallet 1.3.4.1 but I have two weirdnesses...
1) it often gets stuck syncing at "0 days remaining"
2) there's a yellowish bar stating "Warning: Displayed transactions may not be correct! You may need to upgrade, or other nodes may need to upgrade."

You could delete everything but wallet.dat (make a backup-copy of this one before anyway and store it in a safe place!!) in your CGA-directory and then restart the wallet. It should download the blockchain again and be in sync then.
The CGA-directory is found here:
C:\Users\Username\AppData\Roaming\Cryptographicanomaly
Place a file named cryptographicanomaly.conf there before restarting, so you have only wallet.dat and that file in the folder and it should resync correctly.
The contents of cryptographicanomaly.conf should be (see first post of this thread):
addnode=91.132.178.106
addnode=88.218.101.44
addnode=115.29.160.13
addnode=78.13.151.160
addnode=115.29.160.13
addnode=93.171.209.97
addnode=190.177.100.76