So I recently returned to an old project after about a month. It said the file needed to be updated to the most recent version of Premiere, so I let that rock. Now the project is mainly comprised of clips taken from a single source file, but the issue stems from this. That source file for some reason has been changed to a 4:3 ratio, and subsequently the hundreds of clips I pulled from it are now also in that ratio in my timeline. All other files, graphics, etc, in my timeline are still in the proper 16:9 ratio. I double checked, and the source file on my harddrive is totally unaltered in any way, it's only being displayed as 4:3 in my bin and timeline. Anyone know a way to fix this? The only solution I can think of is to delete the original source file from my library and re-add it, but this will also delete the hundreds of clips in my timeline from it, undoing weeks of work.
What version was the project originally made/saved in? What version did the app indicate you needed when you went back to it? What was the exact message you received? Something is missing here.
Dell Precision T7600 (x2)
Win 7 64-bit
Adobe CC 2017.1 (as of 8/2017)
256GB SSD system drive
4 internal media drives RAID 5
Typically cutting short form from UHD MP4, HD MP4, and HD P2 MXF.