Please be aware, that feature actually/only means "don't allow static IP users", and does not mean users have to renew/request
DHCP when they roam, affect lease times, or anything like that.
What "issues" are you seeing, with what type of client, on what type of WLAN, on what model AP, Louis-Philippe?
Unleashed 200.0 GA only supports R500/R600 model APs.
I have not seen any Unleashed 'bugs' in 200.0.9.9.608, and/but I filed a few feature requests...
We had to confirm all possible tests for a seamless upgrade from Unleashed 200.0 GA to version 200.1.9.12.55 (final build),
over the weekend, and that's why the official release occured on Tuesday.
Existing new 9U1 model Unleashed APs with current 200.0 code, will be recognized and upgraded/configured by 200.1.9.12.55
when added to the LAN.
Unleashed 200.1 now has SmartMesh for your indoor R500/R600 and adds our T300 series outdoor APs. (so far)