Hey Carlos,
You can reproduce by simply grabbing the webview example (http://mobile.tutsplus.com/tutorials/corona/corona-sdk-webview/) compile for device (iPhone) or Xcode.
- Set the URL in main.lua to something that takes a little while to load
- Compile for Xcode and ensure the device is iPhone
- Click the button to open the webpopup, then while it’s still loading click the back button. Now click the button again to open the webpopup…the popup never appears.
(Note: The tutorial doesn’t work in iPhone4 because the back button is not displayed so in Xcode make sure you have the device set to iPhone.)
My App is 100% ready to submit to the apple store as soon as this and the flashing issue are resolved. I’m hesitant to submit something with bugs in it as it would no doubt affect my applications rating on the store. Particularly as competing apps do not have this issue.
The WebPopup itself needs a complete overhaul as unlike all other SDKs I can find which show a webpage loading (with no flashing), the WebPopup with Corona basically loads most of the webpage behind a loading screen before displaying it…this suggests to me that the flashing issues while pages are loading are very bad early on so the Corona developers decided to display a loading screen in front of it…I may be wrong here. Either way please please please put this as a priority particularly above any Android issues as surely getting native functionality working properly on iPhone should take precedence!!
Will post some screens of my app soon 
Cheers,
- Will [import]uid: 61273 topic_id: 10649 reply_id: 38854[/import]