Can´t login in 3.0.9 version (update and fresh install)

[patrickrcdm]

Hi guys,

i updated from 3.0.8 to 3.0.9 and now can´t login. (local admin)
i tried in a fresh install .. same error

Page stucks in "in progress".
Before, there is an popup error: "Error: Malformed UTF-8 data"

Any Ideas ?
Running on a WampServer 3.3.0 (fresh install)

Thanks