Okay in answer to administrator marek see below:
Hi.
Can you ensure your iPhone has free space in which to save the log files please? YES Could you also please tell us how many logs you already have on the phone?
NONE - That is the problem
It may be that you have set your accuracy filter to high... so perhaps check that in the settings. You can reset all the settings to the defaults by tapping the default button.
I just changed to 200. But it did not work with default.
When you do turn on logging what does the logging icon in the bar at the bottom say?
It asks if I want to resume logging. When I click YES, it first said NO FIX not is has a number 9 saying it is logging. But there are no logs. NOW it changed to NO FIX... My next step is to delete it and add again
WHAT DOES the button in the upper left hand corner do which says Edit now and changes to Done?
Another thing to try would be to "reset" the application would be to delete it from the phone (by holding down on the icon until it wobbles and then tapping the X). However, if you do this you will lose your existing logs from the device so if you do chose to try this then please ensure you have emailed yourself any you wish to keep first.
Will do this next.