Following the release of The Pillar DLC, PC players using version 1.0 build 247 have encountered invisible walls in upper Paititi preventing them from progressing. For example, here in the doorway where Lara meets Etzli, during the REBELLION LIVES chapter, an invisible barrier prevents Lara from passing through in either direction.
In the Properties window, click the Betas tab. Then instead of 'NONE - Opt out of all beta programs,' select build_243 or build_241. Either should work. Then click Close. (Click screenshot above to enlarge.)
UPDATE: Subsequent updates appear to have eliminated the bug, so now if you choose build_260 or later, including 'NONE - Opt out of all beta programs,' the invisible wall should disappear.
Steam should then download the earlier build of the game. This update won't take anywhere near as long as downloading the full game, since most game files will not be changed. (Click screenshot above to enlarge.)
...and the invisible walls should no longer be an issue.
After you get through the problem area and reach the next checkpoint or base camp, quit the game and reinstall the most recent build, by choosing 'NONE - Opt out of all beta programs' from the Betas tab. This will reinstall the newer content and hopefully help you avoid other bugs fixed by the patch that caused the invisible walls. ;)
Thanks to JK for suggesting this fix on the Steam forums.
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