Upgrade to SD3. This resolved the issue for me. I also have Dell 755's.
You had the same problem I had. You need to download and install the 3.0 Snap Deploy version and make sure you get new keys to work with the 3.0...
Thank you for posting this! I have been going insane over the last 4 hours trying to figure out why it stops at 4 bars! >:(
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