This problem pertains to the cache of the old Market app which comes with update. Make sure the market app is updated (it updates automatically when launched). If you're not sure you've got the latest Market app check under "Manage Applications" and you'll notice a button that says "Uninstall Updates". If it's not updated, clear the information for it, and force close it if it's running. Relaunch it and let it run for about 5 minutes, you will not see it download or notify you when it has been updated, nor it will close and restart. Once a minimum time has passed, hit the back button and open it again you'll notice a new look, hit the "My Apps" button and hit the update all apps. If this step still fails, clear the cache and try again.

Always update your pre-installed apps from "My Apps" box, sometimes it won't detect all apps you may search and you'll right away notice that instead of a "Install" button you'll see an "Update" button which you know you've got the update for it. Make sure you have the latest Flash update before updating YouTube.

Thanks for the reply Omar C. But unfortunately this does not resolve the problem.

The Market version the was installed was the current version (2.2.11). However, followed your instructions anyway - uninstalled updates which took me back to the factory installed version.  Few minutes latter The Market updated back to version 2.2.11.

The YouTube app was indicated as having an update. Selected to Update. New app downloaded and started the installation process, which appeared to be successful.

The status line indicated "Installation unsuccessful". When I selected to clear "Installation error" dialog box appears with the message "Package file was not signed correctly". Selecting OK clears the box.

This appears to be the only app that this happens to. 

 

 

 

 

The improperly signed app error could very well be that the certificate they used to sign the app has expired which would be rare becase is a google inc. app. There could also be problems in your internet access preventing the phone from checking the signature on the package with google servers. I've had problems downloading and installing apps and updates but it was because market and google servers were down or malfunctioning which after a few hours seemed to work again.

I would clear the cache for the market app and try to update again. Remember to force close the app before clearing the cache, and try again. Let me know if the problem persists tommorrow.

This problem remains. Over the last few hours I have 'reset' the Market app around six times and attempted to update YouTube in the order of 15 times. The result is always the same as described in my previous posts. It always ends as an unsuccessful installation.

This operation has been tried OTA via 3G and over wifi nothing changes.  When I ping the Google servers - all is well.  Response times range fro 3 - 693ms depending upon the server and operation.

When I attempt to push the update from the Android Market. The result is the same with the same error "Package file was not signed correctly"

 

 

 

 

Strange only you is having this problem. Here's what I want you to try in step to see which can or will work.

1. If you have any prior updates installed on the YouTube app, "Uninstall Updates", and try again.

2. If you do not have updates for the app or attempt #1 failed, try checking the box "Unknown Sources" in Settings/Applications and give it a try. I highly recommend you uncheck this box when you're done, as it possess a risk of websites pushing unwanted apps to your phone.

3. As a last attempt at this and perhaps the last thing I can think of short of reset to factory. "Clear data" for the Download Manager app, which you can find under Applications/Manage Applications/Running, and try to update again.

Omar C - really appreciate your help on this.

Action #1 - no prior updates installed only the clear cache button is available. Just as a side line there is no option to uninstall application on this app.

Action #2 - Reset The market app. Checked "Unknown sources". From Market selected YouTube update.  Process downloads but fails to install - as before.

It should be noted that the YouTube app is never listed in MyApps on Market. I have to search for YouTube the select update.

Looks like Action #3 is the next step.  Before doing so should I take any precautions re installed applications or is that handled by The Market?

 

Well the factory reset seemed to have done it - YouTube updated with no problems.

Apart from reinstalling the apps, etc all is now as it should be.

Thanks again for your support and patience - very much appreciated.

Big smiles all around :emotion-1: