20 Jan 2010
16 Jul 2013
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I have a version 5.0.2860.0 instance of Sitefinity running on IIS7.5 quite happily for a while now but we recently updated the server to .Net Framework 4.5 which has been causing us constant intermittant rendering issues with the site losing it's CSS. This happens through a combination of clearing the browser cache, forcing hard refreshing of the browser and soft refreshing.
Using the built in IE developer tools I can see the main stylesheet (/Sitefinity/WebsiteTemplates/...) missing its text/css type when we lose the styles (images attached). As I haven't been able to solve the issue, I have uninstalled the .Net Framework 4.5 from the server but the issue still remains.
Luckily the server is a virtual server so we were able to restore to a previous version prior to the 4.5 update.
I was also able to clone a working instance of the server to test against and apply the .Net Framework 4.5 update which again caused the same issues.
Has anyone seen this issue before or is there any configurations I should be performing on Sitefinity to get it to successfully run with the .Net Framework 4.5 installed?