Hello all.
I've got an app that is used to analyse the contents of a text file, and displays its progress as it StreamReads the file, before displaying the results.

What I am noticing is that whilst the app is running, if I switch to another application on my PC (not necessarily open another app, but bring the other app into focus), the window that my VB.NET app occupies is blank when I switch back to it - the window title, the form "outline", etc. is there - but the actual form contents (TextBoxes, Labels, DataGridViews, etc. etc.) is blank.

If I leave the app to do what it needs to do to complete the analysis of the file, all of a sudden, it jumps back into life and displays the results.

My question is - why did it disappear in the first place?

Its not just happening on my PC.