Upgrade problems

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Hi Folks!
I'm using C5 for a few months and my website running good. But after i upgrading from 5.1 to 5.2 there is a big problem. I uploaded all data, and then doing the upgrade script thingy. It says "Upgrading ok" After i returned to the dashboard, there is nothing shown. Just a frame, but no text and nothing. When i go the startpage, this page is also blank. What did i do wrong? I uploaded after that the language file, because i thought only language file is missing, but the error stays. Can anybody help me?
Sorry for my bad english"

 
lordrobe replied on at Permalink Reply
sorry, it was my fault, after studying the c5 files, i saw that there was a "blocks" folder in the root directory. After deleting this folder, c5 works fine again, i wonder myself, why c5 is parsing this?