Jörg,

Usually if you have a long running process in a timer you code it like this:

* tmr.timer
this.Enabled = .f.
* do the long running thing here
this.Enabled = .t.

There are also times will not respond to a timer event if you are running a long SQL command for example. Timers will basically only fire between lines of VFP code.

>the timer is enabled. I made a button that shows me the actual state of the enabled property and the timer interval.These seem to be Ok. I only change the timer interval via a command button on my form and the timer starts again. This is what I could see. Is there an OS issue or does it affect the timer if the task in the timer event need longer than the timer interval ?