UI Will Not Open

After using Heidi version 9 with little problems on win 10 for 5 years, all of a sudden i got an invalid window 1400 error showing when i logged in. All attempts to re-open simply queued instances in the task manager.

I tried fullinstall of latest version (12?) after a full un-install. Then after looking at people wrestling with this on the forums i tried deleting off all the registry entries after full reinstall, deleting all folders and reinstall. Still same issue.

Im beggining to think this is something to do with a recent windows update - any help appreciated.

Cheers Andy

Windows AWS version : Windows Server 2019 Datacenter Version 1809

Just got portable version running fine, so i can just use that!

NB I am RDP-ing over 2 screens to my work PC which is RDP-ing over one screen to the server. Perhaps that is behind all this.

I have just realised that normally i use my laptop (one screen ) to RDP to work machine which RDPs to server, so this might be a first.

Still - a windows handle error seems unusual.

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