Very intermittent missing page regions / report rows / page item values

My goals in making this posting are twofold:
1. I'm looking to see if anyone else has experienced this type of issue before.
2. I'm looking for ideas about what can be done to debug such an infrequent bug with serious implications.
Synopsis
I'm having a weird problem where very infrequently I will load a page and I'll notice that one or more page regions, report rows, or page item values are missing. If I reload the page the missing parts appear as they normally should.
By "very infrequently" I would say it happens to me somewhere between 1 in 100 and 1 in 1000 page loads, of course at my last project demonstration in happened twice in 10 minutes to my demo participants. I've attempted to debug this, but most of the techniques I know of involve reloading the page or reposting the form data and (of course) everything looks fine then.
Environment
* This has happened on multiple different pages, under ApEx 3.1 (Linux) and 3.2 (Solaris).
* I believe that so far I've only ever seen this under Firefox 3/3.5 under OSX, but since I do the vast majority of my development with this browser it's not reasonable to conclude that it only happens under Firefox.
Logs
* No application errors during this timeframe.
* Nothing of significance in the database alerts log (just thread notes and log sequences).
* Nothing of significance in the webserver log (just the usual mod_ossl connection errors).
Thanks for your attention,
Jason
Edited by: Jason G on Jul 24, 2009 12:43 PM

Well, thanks for reading the post anyway.
While working through some debugging steps I realized that I was populating some of the regions as the page rendered using AJAX -- this would pause the page rendering until the AJAX request returned. I believe that a hanging AJAX call was the likely culprit of the very intermittent symptoms I was seeing.
I moved the AJAX calls to the last region of the page and added a javascript function that "watches the page load" by checking for regions by ID and looking at javascript boolean flags to let me know when the page is fully rendered. If this process takes longer than 5 seconds it notifies the user that something happened and offers to reload the page for them in an effort to fix the issue.
So far, so good -- but it will take a lot of testing to convince me that this case is solved. I hope my documenting this is helpful for others in similar situations.
Good luck,
Jason

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