Admin Login Page Blank (version 1.8.0) After Supee 6788

[MacRat101]

Hi,

Tried installing SUPEE 6788 via FTP yesterday, and the entire site went blank. I replaced all SUPEE files with the originals (everything was backed up before I began), but all the pages were still blank. I changed the permissions on the var directory, and everything came back to normal.

The only issue is that when I try to login to the Admin/Dashboard, I get a blank white page. I can't login to Admin!

I've read and tried everything that I could, but still can't login to Admin.

Using an error reporting script on the index.php page ... I get the following error when the Admin login info is submitted.

Fatal error: Class 'Mage_Adminhtml_Block_Abstract' not found in /var/www/vhosts/mydomain.com/httpdocs/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Filter/Abstract.php on line 35

I'm thinking this is a permission problem, but I really don't know.. 

If anyone knows how to fix this, please let me know.

Thanks

[Brent W Peterson]

The 6788 extension will "block" custom blocks so you may have a custom block that is preventing your site from loading correctly.

Do you have a development environment you can test in?

[MacRat101]

Thanks for your response!

The problem is fixed!

I started uploading files from my FTP backup, it was something in the app/code folder.

The only issue I see now is ... Page blocks HTML, on the Cache Management page is Disabled???

Any ideas how to fix that?

Thanks Again

[MacRat101]

Alright, forget this one!

I found the "Disable" "Enable" Actions on the Cache Storage Management page.

Don't know how it became Disabled in the first place, but it's fine now.

Thanks