SSDT (Former BIDS) 2012 IDE takes forever to load SSIS project giving message validating OLE DB source.
The three options around this problem: The DelayValidation property, the ValidateExternalMetadata property, and the “Work Offine” option.
As mentioned in the comments section, I was unable to open the project.
So using task manager, killed the process.
Edited the .dtproj.user file. Changed the “OfflineMode” from false to true and then open the project.