roundcube 0.8.1& $rcmail_config['upload_progress'], upload_progress not working

[deisler]

Hello.
I installed 0.8.1 and configured roundcube with enabled
$rcmail_config['upload_progress'] = true;

from phpinfo():
apc.rfc1867   On   On
apc.rfc1867_freq   0   0
apc.rfc1867_name   APC_UPLOAD_PROGRESS   APC_UPLOAD_PROGRESS
apc.rfc1867_prefix   upload_   upload_
apc.rfc1867_ttl   3600   3600

but upload_progress bar not working.

What am I doing not wrong?

Thanks