I am having the same problem with v5.2 in our production web farm environment, with Insert Template. The problem started when "sticky sessions" were removed.
I set MultipleServerMode = True in Editor.config and added the CuteEditorTempPath to Web.config on all machines. Are there any other changes that need to be made? Or will upgrading to 6.x resolve the problem?
It appears that the problem occurs due to the .txt file getting created in the CuteEditorTempPath on one machine, but the subsequent call actually hits a different machine (for example, the error message indicates that the error occurred on server 2, but the .txt file was created on server 1).
I tried pointing the CuteEditorTempPath to a network share but it caused the page to hang when loading, and also, the directory structures are not identical on all machines, so the pathes stored in those .txt files may not match.
Any suggestions would be greatly appreciated.
Thanks,
John