After years of never a problem with lightroom started with lightroom 5 yesterday and today all of a

After years of never a problem with lightroom, yesterday i started wiith Lightroom 5 and today all of a sudden in development mode everything just stopped working. No matter what I do none of the sliders have any effect on the picture whatsoever.
Please help Duncan

you'll need both serial numbers to install the lr 5 upgrade.
if you purchased and downloaded lr 4 from adobe or registered with adobe, you may be able to find your lr 4 serial number under the account used to make that purchase/registration (not necessarily your current adobe id), Adobe ID
and adobe support may be able to help you, contact adobe support by clicking here and, when available, click 'still need help', https://helpx.adobe.com/contact.html

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