Some problems after upgrade to 3.5.4
 

E-mail notification not working, the members get their notification, but the page does not link correctly to the forum. (See attached image)

When a user gives reputation to another user they get: You must give reputation to another user before you can give to $userinfo[username] again.

When trying to view the IP adress on posts we get this message: Ip address is: $postinfo[ipaddress]. Host name : $postinfo[hostaddress].

Check the board URL in you vB Options.

My board URL is correct. I looked at the phrase containing the message, and changed : Ip address is: $postinfo[ipaddress]. Host name : $postinfo[hostaddress], to : Ip address is: {1}. Host name : {2}.
And:
You must give reputation to another user before you can give to $userinfo[username] again. To: You must give reputation to another user before you can give to {1} again.

Now its working fine. I should have thought of the phrases before posting this thread, but maybe someone else have the same problem and could use my solution. :)

Seems to have been the language pack that did not work with the new vb version. :)