We have upgraded CMS from Web 8.1 to Web 8.5 couple of months back. We got three CMS nodes behind the F5, We frequently used to see below list of issues and restarting Content Manager Service Host solves the problem and may happen again after 1 week in that node. At least one node per week shows us this behavior.

List of issues:

  1. Unable to see thumbnails of images inside components.

  2. Used to see below error while page previews or version history comparison etc., in CME.

    (80040356) Could not load file or assembly '0 bytes loaded from Tridion.ContentManager.Templating, Version=, Culture=neutral, PublicKeyToken=360aac4d3354074b' or one of its dependencies. An attempt was made to load a program with an incorrect format. Bad IL format.

    Bad IL format.

  3. Unable to see thumbnails in CME media repository (which are ECL from S3)

We are not seeing any bad CPU or memory metrics in that particular node at the time of failure.

So i am looking for some guidance on how to investigate this?

  • Could be a problem with 32bit/64bit platform loading?

  • In the server is there any scheduled job script anything running on a weekly basis?

  • Is there any antivirus software installed on the server could be blocking the images folders by scanning?

  • Is there any application monitoring tool running on the server?

  • Review the F5 firewall settings

  • Another thought that crossed my mind is that you might have a dependency on an assembly in the GAC that is missing on your environment, maybe worth reupload this DLL to assembly?

  • Tridion.ContentManager.Templating.dll - could be a chance maybe DLL got locked, you need to find this DLL and click Unblock from the context menu

  • Review your Event Viewer Application & Tridion logs to see if there are any errors or warnings.

Your Answer


By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.