I've reproduced this problem on my Win10 host.

If I connect to it with 'resize to fit' unchecked, then I just see a white screen on the client.  As soon as I check the resize box, I see video immediately.  Also, this problem does not reproduce if curtain mode is not enabled.


We have received reports of this issue in the past (based on the invalid resolution being reported) but no repro steps.

Here is an excerpt from the console log (resize not set, host in curtain mode), note the 0x0 resolution:
client_plugin_impl.js:246 plugin: setCapabilities: [rateLimitResizeRequests securityKey sendInitialResolution touchEvents]
client_session.js:629 Connection established.
ui_mode.js:123 App mode: in-session
clipboard.js:87 Got clipboard from OS, type: text/plain length: 43 new: true blocking-send: true
clipboard.js:87 Got clipboard from OS, type: text/plain length: 43 new: false blocking-send: false
desktop_viewport.js:286 desktop size changed: 0x0 @ 96x96 DPI
client_session.js:530 Video channel ready.


Here is a trace with 'resize' set and host in curtain mode:
client_plugin_impl.js:246 plugin: setCapabilities: [rateLimitResizeRequests securityKey sendInitialResolution touchEvents]
client_session.js:629 Connection established.
ui_mode.js:123 App mode: in-session
clipboard.js:87 Got clipboard from OS, type: text/plain length: 2451 new: true blocking-send: true
clipboard.js:87 Got clipboard from OS, type: text/plain length: 2451 new: false blocking-send: false
client_session.js:530 Video channel ready.
desktop_viewport.js:286 desktop size changed: 1244x1090 @ 96x96 DPI
desktop_viewport.js:353 plugin dimensions:1244x1090

Here is a trace with 'resize' disabled and the host in non-curtain mode:
client_plugin_impl.js:246 plugin: setCapabilities: [rateLimitResizeRequests securityKey touchEvents]
client_session.js:629 Connection established.
ui_mode.js:123 App mode: in-session
clipboard.js:87 Got clipboard from OS, type: text/plain length: 1143 new: true blocking-send: true
clipboard.js:87 Got clipboard from OS, type: text/plain length: 1143 new: false blocking-send: false
desktop_viewport.js:286 desktop size changed: 0x0 @ 96x96 DPI
client_session.js:530 Video channel ready.
desktop_viewport.js:286 desktop size changed: 2560x1600 @ 96x96 DPI


It seems related to sending 'sendInitialResolution' and whether the host waits for that or not.