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So just to clarify it for you. The content on your WordPress.com blog will not automatically appear in your GoDaddy installation. You have to move your content over to Godaddy. Start with this article.

Who is hosting your website?

I see no one has responded to your week old query so I’ll give you my take on your problem. I hesitate because I am not using WAMP.

I think it highly likely to be a permission problem.

I encounter this problem all the time on a self-hosted Windows server and not just with plugins but also with WordPress upgrades. (My specs are Window Server 2008, PHP 5.3.13 and recently upgraded to 5.4.24, MySQL 5.5.11, 5 websites)

I have spent countless hours researching the problem and experimenting with no satisfactory conclusion. I have at various times implemented debug code which revealed different errors for different plugins but almost always related to some folder or file that cannot be created or accessed. Sometimes it is a tmp folder that is missing entirely…because permissions are not sufficient for the update program to create the temp folder.

And if I grant higher permissions on either the wp-content folder or the root folder (if doing a WordPress Upgrade) it all works without any hitches.

So for example, in my case I have to give the IUSR user (anonymous authentications) not just read, read & execute, list folder contents but both write and modify permission. If an upgdate program on windows wants to create a temp directory, IUSR has to have modify permissions on the relevant folder.

I give up trying to understand the permissions on windows. As a matter of course I increase the permissions. Do my updates. Then revert the permissions. It also helps in the case of WordPress updates to deactivate plugins before udpating.

I’ve had similar permission issues on Apache installations but these occur less and less often. Not sure why.

Will be interested to hear if this helps your case in any way.

I have never used Ubuntu but on Apache and Windows it is possible to have multiple versions of PHP running and you can then specify which version your site should use. If you really think PHP5.5 is the problem you could try reverting your Site back to whatever version was running before. I can’t tell you how to do that on Ubuntu. Something you will have to research.

Which version of WordPress are you running?

Do you get any error messages when you try to upload or edit?
Or do you have error logging activated. The error log might hold a clue.

I am not a MAC person but whenever I’ve had problems uploading images on a self-hosted windows installation, it looked like a permission problem
but in the end after installing some debug code I found that a tmp directory was missing entirely.

You can do it either way.

Use PHP Admin (In cpanel)
or search the wordpress plugin site for WP Database Backup. It has been around for a long time.

Duplicator is a great (free) plugin that backs up up your whole site including the database. It is sometimes a bit tricky getting it to work if permissions are not correct.

Going off line now so won’t be able to answer more questions until later.

You should check the wp-config.php file first to see exactly which tables are actually being used by wordpress. This file is in the root folder. Edit the file with a text editor and look for this line where xxxx will be whatever prefix is actually being used.

$table_prefix = 'xxxx_';

So do not delete the tables using whatever prefix is found here.