Great news! vBSSO vBulletin 1.5.1 is released now - February 19, 2016.
The major change is the Fix of an issue when vBulletin redirects to WordPress search page after сlearing the browser's cookie and cache. Now, vBSSO redirects you to particular page from which you are logged in. The patched version is available here.
Let's take a look what are the difference:
- before the fix the vBSSO redirects to the Search Page with nothing found result:
- after the fix the vBSSO redirects on the page you are logged from: