Hi Martin,
the screenshot i attach in the first post is relative to a run i have made today to verify if the problem deals with only old logs or also new runs (and the conclusion is that is related also to new runs).
Howewer now i attach the screenshot about log of yesterday failed log (and i confirm that yesterday i saw details).
I have also tried to switch off/on the pc, without solution... maybe for some reason now there is some corrupted file which disables the detail tab... i don't know... any suggestion will be appreciated :-)
thx and bye,
ste