Profiles disappeared?

[None of the above]

I realise that I may have failed to tick a box somewhere, but the "Profile" button has disappeared from the heading above each posting. I've had a look at the User CP but can't find any option there that I may have overlooked. Can anyone advise as to how it may be reinstated, please? Thanks in advance.

[None of the above]

Thanks TCS........

I use Zone Alarm Pro and turned off the ad-blocking function as you suggested but without achieving the desired result. Strangely, under the "Last Post" column on the Forum Home Page, a click on the user name calls up his/her profile. I briefly disabled Zone Alarm completely and lo-and-behold the "profile" button reappeared. I'm working on the assumption that I need to make a not entirely obvious adjustment somewhere deep in ZA.
Thanks again for pointing me in the right direction.