OK. So, I was busy working away on my site, when suddenly my site stopped working.
The entire frontend of the site was screwed, and only the Random products module would load.
LITERALLY, when I checked the code, Joomla was outputting:
<head>
<hikashop content>....
</hikashop content>
<ERROR MESSAGE REGARDING DATABASE LINE 213 something about a QUANITITY in cart being invalid>
</head>
without a single shred of my template (or any template or styling for that matter)
Had me going crazy. I thought my database was wrecked or something. Especially after I checked Joomla's error messages and it was reporting that my database was NULL?!?! So, I clicked "FIX", I purged my cache, I did a lot of stuff.
Finally, I saw that "updates are available" and it turns out it was today's UPDATE NOTIFICATION that wreaked all this HAVOC!
So, I updated and bam, bing, badda boom. It's working again. Thank God - I thought I was going to have to rebuild my entire site.
Was crazy.
I'm running Joomla 2.5.7 w/ PHP 5 and MySQL.