GUI Update stops

Question

Hello,
i'm implementing an application, which permanently updates a TableView and a Label. This works fine in general. But sometimes updating the gui stops, for example if the application was in background and is focused again. Nothing is displayed in the application window in this case (its black or just frozen), but if i manage to find the button positions they react normally.
Did anyone experienced this before? Do you have any suggenstion?
I already tried to call Platform.runLater() less often, but that did not solve the problem.
I also added:
final EventDispatcher eventDispatcher = myScene.getEventDispatcher();  // the original dispatcher
myScene.setEventDispatcher(new EventDispatcher() {
@Override
public Event dispatchEvent(Event event, EventDispatchChain tail) {
long millis = System.currentTimeMillis();
Event returnedEvent = eventDispatcher.dispatchEvent(event, tail);  // let original one handle it as usual
millis = System.currentTimeMillis() - millis;
if(millis >= 100) {  // check if it was slow
System.out.println("[WARN] Slow Event Handling: " + millis + " ms for event: " + event);
return returnedEvent;
as suggested somewhere else in the forum. I did not get any "Warnings".

Answer 1

Adapting the event dispatcher is a strange thing to do.  I wouldn't recommend that.
I'm not sure why you need Platform.runLater either (you might need it, but nothing in your question indicates you do).
To get any help you will almost certainly need to provide an SSCCE.
There are a few jira bugs filed about black screens in JavaFX applications.
For example:
RT-25178 Regression: Background of controls becomes black after waking from sleep
RT-32636 All JavaFX apps stop rendering when coming out of screen lock
You can search for others at:
https://javafx-jira.kenai.com
Whether the bugs apply to your case will depend on your code, environment and what JavaFX version you are using - you will need to check and verify.