Yesterday I had to Install the quickr connector on an upgraded Notes 8.5 client. At my pc everything went fine, ran qkrconn.exe rebooted, sidebar was visible.
At my customers pc I ran qkrconn.exe, rebooted, no sidebar in Notes. So I checked the ususal sources for a solution "google", notes.net, etc. No hint helped.
After some installing, repairing, uninstalling the connector and the notes client I started to compare the 2 installations. One difference between the client pc and my pc was, that I had the sametime plugin installed in the note client.
So I added the sametime client to the customers pc and surprise, surprise... the quickr sidebar plugin appeared....
As the customer doesn't use sametime, I uninstalled the sametime plugin and all of a sudden the quickr sidebar disappeared again. Reinstalling sametime let the quickr sidebar reappeared.