Is this a standard installation or have you done any changes that you think could affect gadgets?
This is a standard installation with EPiServer CMS 6, ImageVault and Composer 4, and nothing special is made for the gadgets. The site is loadbalanced if that has anything to do with it.
Hi, I've filed this as bug #61720. Until this is fixed a workaround is enabling "sticky ip" on the load balancer.
You found solution of this issue because i am facing same issue with my own gadget?
I recommend you upgrade to CMS 6 R2 since the issue has been fixed there:
When trying to add one of the standard gadgets to the dashboard I get this error message:
Exception details:UnknownGadgetException: No gadget template was found for the template id = 000b5e2a-6a31-4b1c-adaa-b074619de55b