I tried to search for an answer to my problem from this topic, but I couldn't find one...
So, here it is:
I have installed the Header Tags SEO add-on - it seems to be really useful, thank you!
It seems to be working fine, but I can't add products anymore. The "add product"-window doesn't open.
It's probably a admin/categories.php -related problem, isn't it? But I went through again all the changes the Install_Admin.txt told me to do, and found nothing wrong. So, if someone could tell me where to look for a problem, so I could check that part of the code once again, I'd be really thankful. B)
Oh, yeah, I made the test. It only found a bunch of missing titles and/or descriptions.