You cannot open a file while another app is just writing into it. But you can open it while Zorro is not writing, for instance when you click Stop and the Messagebox pops up.

Thanks @jcl.

Yes, I understand write locks. However, it seems *diag.txt is _always_ locked - as compared to log files which seem to be copy-able any time.

I will try the Stop trick.

Thanks.

@jcl,

Tried the Stop trick - didn't work - tried with both prompt windows open - Zorro still has diag.txt locked.

Any other ideas?

Thanks.

It's clear that the diag.txt file is often locked because Zorro writes all the time into it. But it should not be locked when nothing is written. I'll inquire what may be the reason, and wil then get back to you.

Update: The diag file indeed remains locked during the whole session for speed reasons. So you must really stop the session for reading it, then restart the session. I've put reading it with the stop trick on our todo list. It will be implemented in the next beta.

Thanks @jcl.

I don't suppose this qualifies as a "critical bug"? (Even though it's been a quite annoying issue since the beginning...) I'll keep looking...

Thanks.