I am a newbie here, and this is my first post here so please don't judge :)
I need help with outlook addin for sharepoint called "harmon.ie". We have been using it (with sharepoint 2010) for years, but suddenly it stopped working with drag and drop function. This only happens in one sharepoint site (where this addin is used mainly). When i drag and drop file to any of the folders in that site - nothing happens (list just refresh). Connections working fine, permissions are set up properly, even given "all rights" as i thought this was the problem. No avail. When I tried in other sites and folders - everything is working fine, files uploading and I am able to see it.
The "harmon.ie" logs it shows one error:
09:15:15,956 ERROR [eclipse-CLR] com.mainsoft.sharepoint.sidebar.SideBarViewPart - External tabs provider was not found
Sharepoint logs doesn't show any bad behaviour comparing to logs when files are uploaded fine. I am not a big coder, just a beginner so any help would be gold worth!