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i tested datebase in 4 hosting its same problem i think there is bug in vbulletin
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As the folks above tried to explain, that's a server issue. It's explained here:
http://www.liquidweb.com/kb/apache-e...cript-headers/
You're best bet is to switch to a host that is willing to work with you. Ask them to help you check the apache error log. Sometimes on big box hosting companies it helps to call back several times until you get a tech that is willing to work with you.
Another thing you can try is, if you've recently added any new mods to your site, you can re-upload all of the files that were recently changed or added making sure that you upload them in ASCII format (EXCEPT IMAGES).