That's also something I already tried but it did not change anything. To be sure, I tried once again right now (latest build of course). The installation ran correctly and I got the success message but the problem is still there.
Maybe, a deletion that was missed during an old update or something like that ?
If it's in the files deleting all of them and installing again should fix it but I usually do not like doing such things. Would you do it ?
And it can also be a DB problem but in that case the control tool should see it no ?