2016-10-08 01:57:53,621 Error during encoding: Traceback (most recent call last): File "/usr/lib64/python2.7/site-packages/xpra/server/source.py", line 2180, in encode_loop fn_and_args(*fn_and_args[2:]) File "/usr/lib64/python2.7/site-packages/xpra/server/window/window_source.py", line 588, in compress_and_send_window_icon assert wrapper.datatype in ("premult_argb32", "png") AssertionError }}}} is sometimes printed to stderr; everything looks worky tho.
Good catch, r14043 should fix this. (it was rare because it would only fire when we find that not compressing the window icon is actually smaller than the compressed version, which should be quite rare - I never hit it before!)
Closing, feel free to re-open if you see it again.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1336