OK... This will add the "Go" button back when viewing a thread (which is the only time I think it is necessary)
First you need to Add a New Plugin...
In Admin CP go to Plugin Manager -> Add a New Plugin
Product: vBulletin
Hook Location: showthread_start
Title: Go Button Register ShowThread
Execution Order: 5
Plugin Code:
$goforum = $threadinfo['forumid'];
vB_Template::preRegister('forumjump',array('goforu m' => $goforum));
Set Active to YES
and SAVE.
Now you must edit the forumjump template.
In Admin CP -> Style Manager -> Edit Templates -> forumjump
Find the line:
<a href="{vb:raw navpopup.link}" class="popupctrl"><span class="ctrlcontainer">{vb:raw navpopup.title}</span></a>
Below it Add:
<vb:if condition="THIS_SCRIPT=='showthread'"><a href="forumdisplay.php?f={vb:raw goforum}" class="textcontrol" onclick="document.location='forumdisplay.php?f={vb:raw goforum}';return false;">Go</a></vb:if>
Save Changes... Repeat for all styles you use.
You will get a Go button like in the picture...
https://vborg.vbsupport.ru/attachment.php?attachmentid=124512&stc=1&d=1292466333