Upload new style only works sometimes.

[Drache28]

I tried to upload some custom style. However it always returns with just this blank page.

Interestingly some of the style appeared afterwards. However when I tried to duplicate a custom style by downloading it. Then tried to upload it again as new style with a different name. It just keep showing me that icon and won't let me upload. I've tried to clear cache and tried to upload it 6 times already.

What could be causing this problem?

[Mark.B]

This is something you would need to ask the author of the style.

[Drache28]

Mark.B The author is me and vbulletin. I simply just downloaded the current style that I am using on my forum. saved it as xml file then try to reupload it as a great new style and a different name. However it keep getting this error. or blank page.

[Mark.B]

Be worth checking for server security software rules blocking it - eg mod_security.
Uploading styles definitely works in the software, so there's either something in the style blocking it, or something on the server blocking it.