I have 10 U2s. Their total hashrate is reported correctly (Harbringer), but when you click the details, only one is reported - that's the issue.
The proxy is been buggy and is currently not in use.
I only have one S1.
Ah thank you! That makes more sense. Can you send me your ApiLog.json file found in the MultiMiner data folder (%appdata%\MultiMiner)? This sounds like the BFGMiner bug that was in a few of the pre-release binaries.
Here is the latest set of Windows binaries that has a fix for that included:
https://www.dropbox.com/s/1ddrw1rc7jjtiqs/bfgminer_gridseed_pr3.7z