I use 2D Autocad blocks (stored in PDM) as a basis for my part extrudes in SW (also in PDM) and Link and Lock them prior to extrude. Even though they do not change SW tells me the "External References need to be rebuilt..etc". Does anyone know why this happens? We just got these warnings today and the blocks haven't been updated since Jan 2018. Any ideas how to remove or fix this without going through thousands of parts and doing a simple Rebuild? Thanks for your time, this is driving us all crazy. This also happens with library features that reference the same block for our operations. I've attached a couple screenshots.