Hi,
When the instantsupport.exe is called from a RemoteDesktop Session .. the First Screen I see but after that absolute no Screen updates are done.
I klick always refesh refesh refresh refresh (x999)
Does Remote Desktop work for you?
After more 2 000 000 (two million) views on forum for 1.5.0.x development versions... and 1.6.1.0, 1.6.3.0-dev versions
A new stable version, UltraVNC 1.6.4.0 and UltraVNC SC 1.6.4.0 have been released: https://forum.uvnc.com/viewtopic.php?t=38095
Feedback is always welcome
2025-12-05: Celebrating the 23th anniversary of the UltraVNC (26th anniversary since the laying of the foundation stone): https://forum.uvnc.com/viewtopic.php?t=38130
2025-12-03: Could you please complete our poll/survey? Renaming UltraVNC files and service to be more clear: https://forum.uvnc.com/viewtopic.php?t=38128
There was a problem to vote, it is solved now! Thanks in advance!
2025-12-02: We need help: English Wikipedia UltraVNC page has been requested to deletion: https://forum.uvnc.com/viewtopic.php?t=38127
Any help is welcome to improve the UltraVNC page and/or to comment on the Wikipedia Talk page
2025-05-06: Forum password change request: https://forum.uvnc.com/viewtopic.php?t=38078
2023-09-21: Important: Please update to latest version before to create a reply, a topic or an issue: https://forum.uvnc.com/viewtopic.php?t=37864
Development: UltraVNC development is always here... Any help is welcome
Feedback is welcome
Join us on social networks and share our announcements:
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A new stable version, UltraVNC 1.6.4.0 and UltraVNC SC 1.6.4.0 have been released: https://forum.uvnc.com/viewtopic.php?t=38095
Feedback is always welcome
2025-12-05: Celebrating the 23th anniversary of the UltraVNC (26th anniversary since the laying of the foundation stone): https://forum.uvnc.com/viewtopic.php?t=38130
2025-12-03: Could you please complete our poll/survey? Renaming UltraVNC files and service to be more clear: https://forum.uvnc.com/viewtopic.php?t=38128
There was a problem to vote, it is solved now! Thanks in advance!
2025-12-02: We need help: English Wikipedia UltraVNC page has been requested to deletion: https://forum.uvnc.com/viewtopic.php?t=38127
Any help is welcome to improve the UltraVNC page and/or to comment on the Wikipedia Talk page
2025-05-06: Forum password change request: https://forum.uvnc.com/viewtopic.php?t=38078
2023-09-21: Important: Please update to latest version before to create a reply, a topic or an issue: https://forum.uvnc.com/viewtopic.php?t=37864
Development: UltraVNC development is always here... Any help is welcome
Feedback is welcome
Join us on social networks and share our announcements:
- Website: https://uvnc.com/
- GitHub: https://github.com/ultravnc
- Mastodon: https://mastodon.social/@ultravnc
- Bluesky/AT Protocol: https://bsky.app/profile/ultravnc.bsky.social
- Facebook: https://www.facebook.com/ultravnc1
- X/Twitter: https://x.com/ultravnc1
- Reddit community: https://www.reddit.com/r/ultravnc
- OpenHub: https://openhub.net/p/ultravnc
[3.3.1] Screen update
Re: [3.3.1] Screen update
Confirmed on Server 2008 x64 Remote Desktop.
It seems that the fix for the dual monitor issue also solves this issue. I'll get another release out the door with some of the latest bug fixes.
In the mean time here is what you need to do:
1) Open SRC\InstantSupport_Files\ultravnc.ini
2) Find these values:
PollForeground=0
PollFullScreen=1
PollUnderCursor=0
EnableHook=0
3) Change them to this:
PollForeground=1
PollFullScreen=0
PollUnderCursor=1
EnableHook=1
3) Compile again.
It seems that the fix for the dual monitor issue also solves this issue. I'll get another release out the door with some of the latest bug fixes.
In the mean time here is what you need to do:
1) Open SRC\InstantSupport_Files\ultravnc.ini
2) Find these values:
PollForeground=0
PollFullScreen=1
PollUnderCursor=0
EnableHook=0
3) Change them to this:
PollForeground=1
PollFullScreen=0
PollUnderCursor=1
EnableHook=1
3) Compile again.
ChunkVNC - Free PC Remote control with the Open Source UltraVNC wrapper InstantSupport!
Re: [3.3.1] Screen update
Thanks so it works
I tested RDP and Dualmonitor(win7) no problems...
I tested RDP and Dualmonitor(win7) no problems...
Re: [3.3.1] Screen update
I had assumed that it was related to my connect/disconnect issue so I didn't report it. I have an unattended notebook that I'm currently configuring... between the disconnect issue and the screen issue, it was taking (sometimes) 10x to connect 
I just did the changes on the remote machine and had it reboot. Now I'm connecting with only the occasional disconnect issues documented previously.
JonD
I just did the changes on the remote machine and had it reboot. Now I'm connecting with only the occasional disconnect issues documented previously.
JonD
Re: [3.3.1] Screen update
Thanks for the info, this fix is in the next release. 
ChunkVNC - Free PC Remote control with the Open Source UltraVNC wrapper InstantSupport!
Re: [3.3.1] Screen update
This has made a major difference for my connections.
I now connect... sometimes the first time but certainly by the third tine.
JonD
I now connect... sometimes the first time but certainly by the third tine.
JonD
Re: [3.3.1] Screen update
Interesting that it makes such a difference for you.
Since it no longer doing full screen refreshes I wonder if your luck is because less data is being transferred.
Who needs an explanation anyways, it just works better is good enough for me.
Since it no longer doing full screen refreshes I wonder if your luck is because less data is being transferred.
Who needs an explanation anyways, it just works better is good enough for me.
ChunkVNC - Free PC Remote control with the Open Source UltraVNC wrapper InstantSupport!

