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Hi Joe, we are seeing increasing numbers of "invalid viewstate" errors recently, e.g. when saving (losing) edits to a blog post we had this error below, but also on other events. Any thoughts on what might be causing this? v2.4.0.9 on full trust.
2015-09-23 16:58:35,868 ERROR (null) - (null) - (null) - mojoPortal.Web.Global - Referrer(https://www.mysite.co.uk/Blog/EditPost.aspx?pageid=304&mid=333&ItemID=367) useragent Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0 System.Web.UI.ViewStateException: Invalid viewstate. Client IP: 12.34.56.78 Port: 63775 Referer: https://www.mysite.co.uk/Blog/EditPost.aspx?pageid=304&mid=333&ItemID=367 Path: /Blog/EditPost.aspx User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0 ViewState: 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...
have you added any js to the skin recently that might be doing stuff that affects the hidden fields used by viewstate?
other than that I have no idea