I no longer saw my problem in a 8.04 CR fresh installation in two days.
I've just done some stress testing which should have shown the problem but didn't.
It seems to me that I see the sandglass shows more often and it could be that it prevents clicking at the moments the "strange things" may happen.
This improvement needs to be confirmed by a few others (as my problem occurs almost exclusively when this slow computer is overloaded).
I no longer saw my problem in a 8.04 CR fresh installation in two days.
I've just done some stress testing which should have shown the problem but didn't.
It seems to me that I see the sandglass shows more often and it could be that it prevents clicking at the moments the "strange things" may happen.
This improvement needs to be confirmed by a few others (as my problem occurs almost exclusively when this slow computer is overloaded).