I am experiencing something odd, and it must be something I
am doing wrong.
When I'm using Flex Builder (latest version/updates etc) and
execute an Air app during development sometimes it won't appear,
even though there are no compilation errors. Even if I close Flex
Builder, and re-open, running the buid doesn't display. Its a very
simple app example app so there is nothing which should cause it to
fail. Is there a process that I need to kill because it thinks its
already running? I don't see any processes like that...?
1) When hovering over the run or debug buttons at the top of
Flex Builder to start the app, make sure the tooltip displays the
name of your application rather than some other project's name. It
normally defaults to running the 'default application' (or the last
one executed, or currently 'active', I forget); you could be
running the wrong project/application by accident.
2) Not sure if this would prevent a new instance from
running, but check your task manager processes for something
like... adl.exe (I think?) and kill any you see. You can find the
actual name by starting the app and from the Task Manager
"applications" tab, right-click select "Go to process" on your
application's entry there. It'll bring you to the process running
that window so you can see the name.
I've probably had this happen a few times but I can't recall
what else may have caused it atm.