I went from 1.4.9 to version 1.4.10
Some Links are not clicking
Not all the links
Some useful links
sorry Google translator english translation
links
[url] [/url]
disappear when you add links
Can you post a URL and a test account??
Does the same thing happen to your default theme?
Then I suspect that maybe some of the files were not uploaded properly during the upgrade. It happens as some ftp clients are known to drop files during the transfer. Anyway, try to overwite your forum files with a fresh set from the mybb 1.4.10 package minus the install folder and the settings.php and the config.inc files in the inc directory and see if that would solve the problem.
P.s. This issue happened right after the upgrade without you doing any modifications to the forum?