We cannot guarantee 100% functionality of all features of CloudExtend Gmail whenever Conversation View is off. This is because it is not possible to accurately identify the email that is being attached in a conversation thread. This is a Google limitation.
The basic functionality of attaching emails to records using the Celigo gadget is supported though. The Celigo send feature (including Create and Attach) may not always work properly when conversation view is OFF.
However, we do a have a work around for it which is planned for a future product release.