The following warning appeared in my K2 Categories:
Warning: syntax error, unexpected '=' in Unknown on line 1 in /home/kandoart/public_html/administrator/components/com_k2/views/categories/view.html.php on line 71
Now the only thing working on my website is the Home Page. Links to all my other web pages are blank.
Really bad news for me. Not sure what caused it but recently attempting to build a Blog Page and had to update K2 as the User module was missing from my earlier installation.

Hi. What version of K2 are you using? Please update to the latest stable available ( 2.6.2 currently).

I have the same warning ... after upgrading to 2.6.2!!!

So... what exactly is going on?