I've tried the latest xpra+winswitch (1.0.2, 0.12.23) on ubuntu 16.04 but this was always the case also with previous versions. i've tried different video settings but even on grayscale and choose "low latency" the keyboard and screen still lags a little especially compared to using winswitch with NX. i'm using mostly in seamless mode , eclipse+terminal and in both NX is much smoother

I updated from the PPA last week and noticed the html5 client no longer works. I just get an empty white screen instead of windows loading. I was able to fix this by copying the /usr/share/xpra/www folder from a system that had a prior working install on it.

A hint may be here:

Files www.broken/connect.html and www/connect.html differ
Only in www.broken: connect.html.br
Only in www.broken: connect.html.gz
Common subdirectories: www.broken/css and www/css
Only in www.broken: favicon.ico.br
Only in www.broken: favicon.ico.gz
Files www.broken/favicon.png and www/favicon.png differ
Common subdirectories: www.broken/icons and www/icons
Files www.broken/index.html and www/index.html differ
Only in www.broken: index.html.br
Only in www.broken: index.html.gz
Common subdirectories: www.broken/js and www/js

I'm seeing the following error trying to connect from a 0.12.17 client on lucid to a 0.12.17 server on gentoo:

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py", line 249, in run
    self.__run()
  File "/usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py", line 120, in wrapper
    return real_cb(real_s, condition)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py", line 283, in callback
    self.simulate() # fire Twisted timers
  File "/usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py", line 293, in simulate
    self.runUntilCurrent()
--- <exception caught here> ---
  File "/usr/lib/python2.6/dist-packages/twisted/internet/base.py", line 778, in runUntilCurrent
    call.func(*call.args, **call.kw)
  File "/usr/lib/pymodules/python2.6/winswitch/client/server_line_connection.py", line 603, in start_login
    self.add_current_user()
  File "/usr/lib/pymodules/python2.6/winswitch/client/server_line_connection.py", line 397, in add_current_user
    self.handler.binencode(settings.xkbmap_query),
  File "/usr/lib/pymodules/python2.6/winswitch/net/protocol.py", line 90, in binencode
    return	binencode(data, self.binary_encodings)
  File "/usr/lib/pymodules/python2.6/winswitch/util/format_util.py", line 21, in binencode
    return	BASE64_PREFIX + base64.b64encode(data)
  File "/usr/lib/python2.6/base64.py", line 53, in b64encode
    encoded = binascii.b2a_base64(s)[:-1]
exceptions.TypeError: b2a_base64() argument 1 must be string or read-only buffer, not None

The connection shows up as successful, but no applications or sessions are available. This problem also happens with 0.12.16, but goes away if I downgrade the client to 0.12.15.