for 2 weeks i have had this horrible error. Once i posted a new article, the blog showed me "No posts match your criteria" on every page i navigated. The Admin Panel showed me the number of articles on the blog, but i couldn't see them.
I downgraded to 2.7.1, replaced the db, aplied the xlm backup and everything was ok... The next day i posted a new article...and had the same problem. After 4-5 refreshes, the blog was ok.
What is going on?? Please, help me! :(
the blog: http://umbluliber.com