As the title says: i´m on Blender 4.5.3. When I start a new file and there is the default cube, i can click on it and the playhead starts. Click again: Playhead stops.
Now I add a sphere: I can´t select it by clicking. When I go into the outliner I can select the sphere.
What´s going on?
Untitled5.blend (546.4 KB)
Just checked: Ver. 4.0 hasn´t this Problem
Sounds like you need to delete/reset your preferences.
If I only knew which!
Back them up for safe keeping, then File / Load Factory Settings.
I did so. No change.
Now I tested the Zip- Version. Same behavior.
Is there really nobody in the wide blender world who observed the same problem?
I have never observed this problem, on any version of blender, in any circumstance, no.
Are you using a standard keyboard and mouse, or something else?
Yes. Both from Logitech. Furthermore i changed between “Radiomouse” and “cablemouse” No difference. After that I downloaded and installed Blender 4.5. 3 on an other PC: Works like a charm.
I really don´t want to reinstall Windows 11.
Try running the blender with administrator privileges
On the Run icon, right-click and select Run as Administrator. 
I tested it, no change. Thank You
It worked on Windows 11 ? what version are you using now ? that’s definitely a weird one
Windows 11 24H2. The problematic Version of Blender is 4.5.3, which works on another PC.
Now I can tell You: Win 24H2 reinstalled. Blender 4.5 problem gone. But now I cannot find Addons like loop tools, cell fractur etc.
I checked Your proposals but no success. Afterwards I installed 4.5.3 new but no change. I have LAN and am online permanently (thats what I believe You mean with: (“You must be checked in…”)
After trying a lot of things MS Copilot after a lot of useless informations gave the dicisive hint. when mentionimg VISUAL C ++ distributables. After installing that as far I can see my problems are gone.
The issue was already discussed in https://projects.blender.org/blender/blender/issues/131052