What error messages are you seeing?
Thank you so much for your email. I do not see any error messages. I read an Adobe blog by John Nack which suggested deleting old backup files to create memory storage. I saved the last 10 most recent backups. When I tried to open LR (ver 3.6), it did not respond at all. I clicked the LR icon to open the program and nothing happens. I hope you or the Adobe LR community can help me. I am in a bind. Thanks! Bob
When you try to launch Lightroom with holding the Keys:
Ctrl + Alt + Shift (Cmd + Opt + Shift for Mac) you should be prompted to launch Lightroom with a New Catalog.
Try this to see if the applications will launch correctly. If so, the cause is probably linked to the current Default Catalog
that is used by Lightroom to Launch.
More Short Keys:
Hope This Helps
Hello Drt. Harrie,
Thank you so much for your email and advice. I attempted to launch LR while holding down the Ctrl+Alt+Shift keys. This opened a dialog box allowing me to view "Lightroom Properties". Unfortunately, it did not prompt me to launch LR with a New Catalog. The dialog box did not contain any option for me to address or change a Catalog option. I do thank you for your help and appreciate your suggestion.
Hello Drt. Harrie,
Thanks again for your email and help. I did as you instructed (double-click on LR, hit Ctrl+Alt+Shift), but nothing happened. Unfortunately, when I double-click on LR, I get no response whatsoever from my PC. I believe that must have deleted something important that existed in some of the older back-up files. Thanks again for your help. I appreciate it.
Annoying we can't get it fixed like this. Might be helpfull to check the following Document from Adobe:
This shows the location, paths, and information about the files used by Lightroom on your system.
Might be something to try to clean out all files from the System, make a Clean install of Lightroom
Then try to open a Backup of your files, lets hope this will allow you to work with Lightroom again.
If I upgrade to LR5, will this get my LR going again and refer back to the existing LR backup files remaining on my hard drive?
My advise would be to try it at least with a Backup or a Copy of the Catalog, if you want to try this.
As Upgrading to LR5 will include an Upgrade of the Catalog, this would result in not being compatible with LR3 Catalog anymore.
I don't believe the Upgrade to a newer version will fix the Catalog, But Installing LR5, might help you at least to get the application
running again. (you can try it with a Trail of Lightroom 5, before buying to see if it might help)