LR 4.2 64bit
Win7 SP1 64bit
During catalog backup any mouse wheel movement brings this dialog
[Window Title]
Confirm
[Main Instruction]
Lightroom was unable to back up the catalog named “LR catalog”.
[Content]
Please check your folder permissions, and make sure that you have available space on your backup drive and main catalog's drive.
[Try Again] [Choose Different Backup Folder...] [Exit]