@FLOOD, Thanks to try to find a solutions. One more clarification for you, to not loose too much time with this. This issue is a kind of “random”, by example we manage somewhere 11 computers with exactly de same version of the OS, TeamViewer, and KFA. 9 work perfectly, but 2 computers have this issue. Another place we have 6 computers with the same configuration, and only 1 has this issue. All of them upgraded from 2019. If we find something, we will post it later, and if somebody else have this issue and found a solution, please share! ☺