Hi Kyle - thanx for your advices, but your recommended fixes do not solve the problem. Besides the fact that I have now discovered that the same problem exists with other sites I have previously commissioned with Joomla v.3.1.5 and CB Quickstart Pro, I have also confirmed that this problem also exists on an absolutely clean install, whether the fixes are applied or not. Have a look at the instance previously advised of in my support ticket, except substitute 'preprod2' for 'preprod1' (change '1' to '2'). Use the same access details as provided in the support ticket - I have also validated 'demouser' for you as an ordinary registered user. Please investigate further and advise - many thanx in advance.

Thanx for tracking this one down, Kyle. For now I've disabled the CB AntiSpam captcha facility on the CB Login module for the sites concerned, as the clients would be more unhappy to note that the URL is no longer 'SEO-friendly' (not that they really understand what SEO is all about, anyway). The CB that I installed came from the Quickstart Pro package, was not modified in any way, and I can confirm that router.php does indeed exist in the directory concerned. It's imperative that the CB AntiSpam captcha be made to work with the CB Login module eventually, however, as there are bots doing the rounds that attempt automated logins and registrations - I've had to clean the logs more frequently recently, due to precisely this factor. Nonetheless, thank you very much for your assistance in this regard, and I look forward to the eventual release of the updated CB AntiSpam plugin and/or CB, as the case may be. Have a great day/night!

Thanx Kyle. Will certainly check out how best to leverage CB AntiSpam's functionality for these sites - the plug-in is actually new to me. In the past I've mostly used Akeeba's Admin Tools product together with OS scripts for such administration, but there is certainly nothing preventing me striving for the best of both worlds, so to speak. Thanx for your guidance in this regard.