[Ted S]

It also looks like the special variable $lv_vb_eventforums_eventdetails (or {vb:raw lv_vb_eventforums_eventdetails as it is in 4.0) doesn't work right. Check of the code shows it's not being rendered into the SHOWTHREAD template.

FIX:

Find:

$lv_vb_eventforums_eventdetails = $lv_vb_eventforums_eventblock;

Add:

$templatevalues['lv_vb_eventforums_eventdetails'] = $templater->render();
  vB_Template::preRegister('SHOWTHREAD', $templatevalues);