I just upgraded another test astaro box from 7.180 to 7.185 and got that message while atempting to log on for the first time [:(]
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Information:
Unrecognized character \xA4 at (eval 274) line 1, chunk 1.
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whereas on this box user/password is very simple:
user: admin
pass: welcome
and I'm no more able to access... if needed I can provide ssh access and web interface access...
thx