Was having problems w/ image uploads stalling, so I upgraded K2 to 2.5.7 (running on Joomla 1.5.22). Since I've done that, the same problem persists but also now my items don't load from the front end. See., e.g., twincityderbygirls.com/site/about/teams-staff/itemlist/category/5-twin-city-travelers. I can see them all on the back end, all the articles are there, but they won't load on the front end. I know some items have no images; they're the ones I was having trouble with earlier.

I tried with one item, its category and subcategory, the suggestion that was made in another thread -- to check the k2 tables in the database for the language field. That field was blank in both category and item tables, but when I changed it to * in all three (for the one item), that item is still not displaying.

Hope that makes sense. I'm pretty new to K2.

fixed. See this thread: getk2.org/community/New-to-K2-Ask-here-first/158920-Error-HTTP-500-on-displaying-item-detail

Odd problem with the mailto.php core component. Same as the other user described, same fix took care of it completely.

Instead of hacking core K2 files ( you will loose your changes in future updates ) you should try first update Joomla! to 1.5.26.